Heritage
(Model 8091)
Pellet Stove
OWNER’S MANUAL
Operating Instructions
Please read this entire manual before installation and use of this pellet fuel burning room heater.
Failure to follow these instructions could result in property damage, bodily injury, or even death.
CONTACT LOCAL BUILDING OR FIRE OFFICIALS ABOUT RESTRICTIONS AND INSTALLATION
INSPECTION REQUIREMENTS IN YOUR AREA.
SAVE THESE INSTRUCTIONS FOR FUTURE REFERENCE!
Heritage Pellet Model 8091
Report: 261-S-04b-2
Manual: 6400-40465-1
Revision: 8 - 6/12/2012
Hearthstone Quality Home Heating Products, Inc.
Heritage Model 8091 Pellet Stove
Intentionally Blank
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Hearthstone Quality Home Heating Products, Inc.
Heritage Model 8091 Pellet Stove
Table of Contents
Operation................................................................................................................................ 4
Loading Pellets .................................................................................................................................................... 4
Modes of Operation ............................................................................................................................................. 5
Ash Disposal ...................................................................................................................................................... 25
Maintenance ......................................................................................................................... 26
Daily ................................................................................................................................................................... 27
Weekly or as Needed ........................................................................................................................................ 27
Monthly .............................................................................................................................................................. 27
Yearly or Every Ton of Pellets ........................................................................................................................... 28
As Needed ......................................................................................................................................................... 30
Glass Replacement Procedures ........................................................................................................................ 31
Troubleshooting .................................................................................................................. 32
Display Messages: ............................................................................................................................................. 32
General Issues: .................................................................................................................................................. 34
Replacement Parts & Optional Accessories List .............................................................. 36
Safety Label ......................................................................................................................... 37
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Hearthstone Quality Home Heating Products, Inc.
Heritage Model 8091 Pellet Stove
Operation
CAUTION: HOT WHILE IN OPERATION! KEEP CHILDREN, CLOTHING, AND FURNITURE AWAY. CONTACT MAY
CAUSE SKIN BURNS.
CAUTION: DO NOT USE CHEMICALS OR FLUIDS TO START THE FIRE.
CAUTION: DO NOT BURN GARBAGE, FLAMMABLE LIQUIDS SUCH AS GASOLINE, NAPHTHA, OR ENGINE OIL.
CAUTION: THIS UNIT IS DESIGNED TO BURN ONLY PREMIUM NATURAL WOOD PELLETS. DO NOT BURN ANY
OTHER MATERIAL NOT DESIGNATED AS WOOD PELLET FUEL. USE OF CHUNK WOOD IN THIS STOVE IS
PROHIBITED BY LAW. BURNING ANYTHING OTHER THAN WOOD PELLET FUEL CAN CAUSE OVERFIRING,
DAMAGE THE APPLIANCE, AND WILL VOID THE WARRANTY.
USE ONLY THE BURN POT DESIGNED FOR THIS STOVE – DO NOT SUBSTITUTE WITH OTHER PARTS OR USE
A GRATE TO HOLD THE FUEL.
WARNING: DO NOT ABUSE THE FRONT DOOR GLASS BY STRIKING, OR BY SLAMMING THE DOOR.
CAUTION: DO NOT OPERATE THIS UNIT WITH BROKEN DOOR GLASS.
DO NOT ALLOW FIRE TO BURN TOO CLOSE TO THE GLASS.
DO NOT OPERATE WITH THE FRONT DOOR, OR ASH DRAWER OPEN – THE UNIT WILL SHUT DOWN.
DISCONTINUE OPERATION IF YOU SMELL SMOKE COMING FROM THE HEATER.
IF A MALFUNCTION IS SUSPECTED, TURN THE UNIT OFF USING THE CONTROL PANEL, DO NOT UNPLUG!
IF THE FLAMES BECOME SOOTY, OR THE BURN POT OVERFILLS WITH PELLETS, IT IS RECOMMENDED TO
TURN OFF THE STOVE AND THOROUGLY CLEAN ALL STOVE AREAS AS PER MAINTENANCE DIRECTIONS.
WHEN OPERATING NORMALLY, THIS APPLIANCE COULD TRIGGER SMOKE DETECTORS INSTALLED TOO
CLOSE TO THE UNIT.
Loading Pellets
Lift the hopper door vertically until fully opened, open secondary hopper door; add pellets into hopper until full.
In order to maximize hopper capacity, push pellets into void spaces. With all voids full, maximum hopper
capacity is approximately 50 lbs of pellets. To reduce the introduction of fines, or spillage, we recommend the
use of a secondary container to add pellets. Clean up any pellets spilled on, or down inside the stove.
Store pellets in a dry location, and outside the required clearances to combustibles of the heater.
NOTES:
WARNING! TOP GRILL AND FRONT EDGE OF STOVE CAN BECOME VERY HOT, AVOID ALL CONTACT WITH
HEATED SURFACES
IF THE HOPPER DOOR IS LEFT OPEN, A CAP OPEN MESSAGE WILL SHOW ON THE DISPLAY. AN OPEN
HOPPER DOOR WILL AUTOMATICALLY STOP FUNCTION OF THE FEED AUGER, AS THE AUGER POSES A
HAZARD TO FINGERS DURING OPERATION.
TO ACKNOWLEDGE THIS MESSAGE, SIMPLY CLOSE THE
HOPPER DOOR.
All operations of the stove are initiated from the User Interface pad. This pad is designed to provide simple,
user-friendly operation of the stove. There are only four buttons on the interface pad, Power (On/Off), MENU,
+, -. During normal operation, the interface screen will illuminate red. When the unit is in OFF mode, but power
is supplied, the pad will display its operational state without the red backlighting. If an error is detected, an error
message is displayed, and the readout will flash.
Power
Plus
Menu
Minus
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Hearthstone Quality Home Heating Products, Inc.
Heritage Model 8091 Pellet Stove
Operation
Modes of Operation
The Heritage Pellet Stove has various modes of operation. They are:
Manual – Most basic mode (no thermostatic control).
Thermostat – Optional mode. Requires an external mili-volt thermostat sold at your local Hearthstone
dealer or hardware store.
Automatic – Easiest automatic mode. Requires the use of the Hearthstone’s Room Sensor (included with
the stove).
Programmable – Best automatic mode. Requires the use of the Hearthstone’s Room Sensor (included with
the stove).
Note: If the stove is triggered to shut down and then triggered to turn back on immediately, it will still go through
the complete shut down and startup process.
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Heritage Model 8091 Pellet Stove
Operation
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Heritage Model 8091 Pellet Stove
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Hearthstone Quality Home Heating Products, Inc.
Heritage Model 8091 Pellet Stove
Set the Current Time/Date (Programmable Mode)
Prog
70 F
time
Action
Step 1: From the main display press
twice.
Step 2: Press the
button to enter the Time menu.
Time
Set
Step 3: Press the
button to enter the Time Set area.
Time
9:25
Step 4: Use the
day
25
Mont
h
Year
2009
we
- 1:0 Prog
70 F
button to set the hour and the
minutes. Once the time is set press
button to set the
to continue.
Note: 24 hour clock is used on this stove.
Step 5: Use the
the month.
Press
and
buttons to change and set the current month
to continue.
Step 7: Use the
Press
buttons to change and set the current day of
to continue.
Step 6: Use the
of the year.
Press
and
and
buttons to change and set the current year.
to continue.
Step 8: The current day of the week displays. Press
settings.
to confirm the date
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Hearthstone Quality Home Heating Products, Inc.
Heritage Model 8091 Pellet Stove
Operation
Programming the Heating Schedule (Programmable Mode)
The stove can be programmed with two different set temperatures, one home and one away. Each of these set
temperatures have two different times they can be switched on. The stove can use the same Home and Away
time every day of the week or they can be set differently for every day.
Setting the Home and Away schedule
Prog
70 F
time
Action
Step 1: From the main display press
Step 3: Press the
Time
prog
Step 4: Press the
week
day
button to enter the Time menu.
Step 2: Press the
Time
Set
twice.
button to toggle the program
Set Time area.
button to enter the program choices.
Step 5: Press the
button to set the Home and Away times if the same
times are to be used every day of the week. Then skip to Step 8.
Press
button to select if the Home and Away times are
customized for each day of the week.
Step 6: Press the
button to select the Daily programming option.
MO
Step 7: Use the
Home
1
away
2
Press the
button to advance to the Home and Away times for that day.
Step 8: Use the
and
temperature to start.
buttons to adjust the time for the Home
1
Press the
button to advance to the next set time and then repeat step 8
until all the times have been set.
Note: 24 hour clock is used on this stove.
Step 9: Press the
Prog
70 F
button to toggle between the days of the week.
button to toggle to a different day of the week or
continue pressing
until the main display is reached.
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Hearthstone Quality Home Heating Products, Inc.
Heritage Model 8091 Pellet Stove
Operation
To Adjust Home and Away Temperature (Programmable Mode)
Action
Prog
70 F
Step 1: From the main display press
or
to view the Home set temperature
to view the Away set temperature.
Home
70 F
Step 2: Press the
Home
65 F
Step 3: Use the
home
65 F
Step 4: Press the
to modify the set temperature.
and
buttons to change the temperatures.
button to confirm the change in the set temperature.
prog
65 F
To Turn On or Off
Press the
button to turn the stove on and off in Programmable mode.
Note: The stove will not ignite if the set temperature is already achieved.
Startup Cycle
All of the operation modes use the same startup cycle. Once the startup sequence is initiated, the stove does
not require any user intervention. The entire sequence will take between 10 and 20 minutes depending on the
starting temperature of the stove and type of pellets.
Ignition
The igniter, auger, and exhaust fan turn on immediately when the ignition phase is started. The burn
pot will partially fill. The amount of filling depends on how full the auger is before the stove is started
and the amount of ash and clinkers in the pot. Once the initial amounts of pellets are in the pot, the
auger will stop until the pellets ignite. The unit will smoke for a few minutes as the pellets heat, shortly
followed by visible flames.
The convection fan will start as soon as the firebox reaches a specific temperature. When ignition is
complete, the pellets will begin to feed to maintain the fire.
Once the flame temperature in the firebox has reached a specific temperature, the unit will progress to
the start phase.
Start
The start phase operates until the flame temperature sensor in the firebox reaches the normal operating
temperature.
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Hearthstone Quality Home Heating Products, Inc.
Heritage Model 8091 Pellet Stove
Operation
Shutdown Cycle
The display with either read Stop or Off depending on if the unit is shut down manually or from the wall
thermostat / room sensor. When the shutdown process starts, the exhaust fan is switched to high.
Once the fire is fully extinguished the control will either display OFF or STANDBY.
OFF will display if the shutdown was manually initiated, or STANDBY, if it was turned off by either a wall
thermostat or a room sensor.
Quick Cleaning Cycle
Every hour the unit enters a quick cleaning cycle. The cleaning cycle is the same for every operating mode.
The cleaning cycle will last several minutes, and then the stove will return to the current operating setting.
During the cleaning cycle, the feed rate of the pellets decreases and the exhaust fan speed increases.
Shutdown Cleaning Cycle
After the unit runs for five hours, it enters a more extensive shutdown cleaning cycle. The stove cleans the burn
pot by stopping the pellet feed and increasing the exhaust fan speed allowing the fire to extinguish completely.
Once the fire is out completely, the stove will enter a normal startup cycle.
Power Outages
The stove does not have backup power to operate during power outages. If the unit is installed with no vertical
exhaust venting, it may cause smoke to backup into the room. To minimize the potential for smoke entering the
room Hearthstone suggests installing the unit with a minimum of five feet of vertical venting and the use of
outside air intake venting.
Once the power is restored, the stove will return to the operational setting active prior to the outage. If ignition is
required, the stove will enter a special ignition procedure.
If you live in an area that experiences frequent power outages, you can use an aftermarket backup power
supply for this stove, or you can use a generator. Contact your dealer for purchase options and assistance.
Frost Setting
This stove is equipped with a frost setting. To utilize the setting, the room sensor must be connected and the
stove must be turned off in the Automatic or Programmable Modes. If the room temperature drops below 42°F,
the stove will automatically turn on at its maximum heat output setting, and then turn off when the room reaches
55°F.
Note: This unit is a supplemental heat source. It will not operate without fuel or electricity. Therefore,
unattended operation time is limited. Use extreme caution with this feature.
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Hearthstone Quality Home Heating Products, Inc.
Heritage Model 8091 Pellet Stove
Operation
Turning On and Off the Frost Setting
Prog
70 F
setup
Frost
off
Prog
70 F
Action
Step 1: From the main display press
Step 2: Press the
three times.
button to enter the setup menu.
Step 3: Press the
button turn the frost setting on and
frost setting off.
Step 4: Continue pressing
to turn the
until the main display is reached.
Adjusting the Exhaust Fan Speed
You should only adjust the exhaust fan speed if the flames have an orange, dirty look and the burn pot has to be
cleaned more than once a day. If the fan speed is too high, the fire will extinguish when on the lowest burn rate,
and the No Pellets error will appear on the display.
Changing the Exhaust Fan Speed
Prog
70 F
setup
Frost
off
Fan
0
Prog
70 F
Action
Step 1: From the main display press
Step 2: Press the
Step 3: Press
three times.
button to enter the setup menu.
twice.
Step 4: Press the
and
buttons to adjust the fan speed faster and
slower. The maximum setting is +30 and the minimum is -10.
Step 5: Continue pressing
until the main display is reached.
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Hearthstone Quality Home Heating Products, Inc.
Heritage Model 8091 Pellet Stove
Operation
Ash Disposal
Disposal of Ashes – Ashes should be placed in a steel container with a tight fitting lid. Other waste shall not be
placed in this container. The closed container of ashes should be placed on a noncombustible floor or on the
ground, well away from all combustible materials, pending final disposal. If the ashes are disposed of by burial in
soil or otherwise locally dispersed, they should be retained in the closed container until all cinders have been
thoroughly cooled. Ensure you firmly seat the ash pan when ash removal is completed.
Note: Do not open the ash pan or front door until the stove is completely cooled.
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Hearthstone Quality Home Heating Products, Inc.
Heritage Model 8091 Pellet Stove
Maintenance
ALWAYS WORK ON A COOL STOVE!
ALWAYS DISCONNECT THE POWER BEFORE PERFORMING ANY MAINTENANCE.
WARNING: DO NOT USE ABRASIVE CLEANERS ON THE DOOR GLASS. SCRATCHING THE CERAMIC GLASS
WILL COMPROMISE ITS STRENGTH.
WARNING: DO NOT CLEAN THE GLASS WHILE THE STOVE IS BURNING, OR WHEN THE GLASS IS HOT.
Proper maintenance is essential to clean and reliable performance of your Hearthstone Stove.
Your Heritage Pellet stove requires routine maintenance and care. Ensure your stove is cool to the touch and
unplugged during cleaning or service. Have qualified service personnel inspect the unit and venting once a year
to ensure that they are clean, free of obstruction, safe, and in good working order. If service is required, only
qualified service personnel should perform it.
WARNING: DO NOT SUBSTITUTE MATERIALS. FOR REPLACEMENT PARTS, OR FOR INFORMATION ABOUT
PARTS OR SERVICE, CONTACT YOUR LOCAL HEARTHSTONE DEALER.
NOTE: TURN THE UNIT OFF. ALLOW THE UNIT TO COOL. DO NOT OPEN THE ASH PAN OR FRONT DOOR
UNTIL THE STOVE IS COMPLETELY COOLED.
Level 1 - Daily
Clean burn pot
1. Open front door.
2. Check for buildup, and remove clinkers if
present.
3. Remove burn pot and sweep ashes into
ash pan if necessary.
4. Clean and check burn pot for wear.
Burn Pot
Clean heat exchanger
Maintenance
Tool
1. Exercise both rakes using provided
maintenance tool.
Rake Rod
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Hearthstone Quality Home Heating Products, Inc.
Heritage Model 8091 Pellet Stove
Maintenance
Level 2 – Weekly or as Needed
Remove ash from firebox
1. Lift burn pot, sweep ashes into ash pan
or use an ash vacuum.
WARNING! USE OF A REGULAR VACUUM MAY
CAUSE A FIRE.
Remove ash from ash pan
1. Remove drawer, deposit ashes in proper
metal receptacle with closable lid.
Clean glass
DO NOT USE ABRASIVE CLEANERS ON THE
GLASS.
1. Use glass cleaner and soft cloth, or use
pellet ash and a water moistened cloth
(rub lightly).
Ash Pan
Level 3 – at Least Monthly
Clean Hopper & Auger
1. Remove auger access plate inside
hopper (8mm wrench or socket).
AVOID DROPPING BOLTS INTO AUGER.
2. Vacuum any fines in hopper and auger
trough.
3. Replace access plate.
Auger Access
Plate
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Hearthstone Quality Home Heating Products, Inc.
Heritage Model 8091 Pellet Stove
Maintenance
Level 4 – at Least Yearly or Every Ton of Pellets
Clean Hopper, Auger & Exterior of Pellet
Engine
Side Panel
Rear Panel
1. Remove hopper door – vacuum hopper and
auger inlet.
Top Casting
2. Remove top casting and grille assembly –
vacuum all surfaces.
3. Remove both side panels (lift using tool
provided), remove rear panel – vacuum all
surfaces
Remove the
screws to
remove the
hopper door.
Do not remove
secondary door.
Heat Exchanger
Tubes
Clean Baffles & Heat
Exchanger
1. Remove and clean firebox
baffles. Inspect for burn
through or cracking –
replace as required.
2. Exercise rakes, vacuum all
accessible surfaces and
spaces
Upper & Lower Baffles
– lift to disengage and
remove from firebox
right sides first.
3. Clean
convection
fan
impeller cage with a soft
brush
–
vacuum
as
necessary.
4. You
can
use
high
temperature stove paint
inside the firebox after
cleaning to prevent rust
during
the
non-heating
season.
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Hearthstone Quality Home Heating Products, Inc.
Heritage Model 8091 Pellet Stove
Maintenance
Clean Convection Fan
1. Remove the screen panel (4 screws) –
vacuum screen and inside housing,
remove any build up from fan blades with
soft bristle brush.
Clean Manifold
Remove Screen.
1. Remove both left and right heat
exchanger access panels – vacuum
inside the manifold.
Clean Exhaust Fan
2. With the access plates removed –
remove any build up from exhaust fan
blades with soft bristle brush.
Exhaust Fan
Blades
Vacuum inside
on both sides of
manifold
Plate with
thumbscrew (x2)
Inspect Gaskets
1. Use the Dollar bill test and check the door and ash pan gaskets for wear, replace as necessary.
a. Open the door, or ash pan, place a dollar bill over the gasket at various locations, close the door
and pull the bill out.
b. If there is little or no resistance, adjust the latch catch or replace the gasket.
Inspect Venting
Soot and Flyash: Formation and Need for Removal - The products of combustion will contain small particles
of flyash. The flyash will collect in the exhaust venting system and restrict the flow of the flue gases. Incomplete
combustion, such as occurs during startup, shutdown, or incorrect operation of the room heater will lead to
some soot formation which will collect in the exhaust venting system. The exhaust venting system should be
inspected at least once every year to determine if cleaning is necessary.
1. Disassemble venting and check for ash and soot accumulation – clean as necessary.
2. Assemble flue connections - seal all connections after cleaning. Follow vent manufacturer’s guidelines.
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Hearthstone Quality Home Heating Products, Inc.
Heritage Model 8091 Pellet Stove
Maintenance
As Needed
External Cleaning
WARNING: DO NOT CLEAN THE UNIT WHEN HOT OR WHEN ANY SIGN OF COMBUSTION IS PRESENT.
External Cleaning - The unit should receive regular cleaning on, under, and around the stove to prevent the
buildup of dust and lint. Clean the exterior painted or enameled surfaces of the unit using soap, water, and a soft
cloth. Do not use abrasive or chemical cleaners. Take care not to scratch the glass or enamel finish (if so
equipped) when cleaning the unit. We do not recommend the use of chemical wax based cleaners or polishes
due to the potential for discoloration of the castings or enamel when the residues of the cleaners or polishes are
subject to heat. Excessive buildup of dust, spider webs, or room air contamination may cause odors when the
stove is hot.
Stone Cleaning
Occasional cleaning is all that is necessary to maintain the natural beauty of your stove’s soapstone/sandstone.
Clean the soapstone only with water or any non-abrasive cleaner and a soft cloth. To remove stains and
smudges from sandstone, buff lightly with 200 or 220 grit sandpaper. Wipe dust from the stone with a clean
cloth. Do not use chemical agents to wash the stone; do not use waxes or any polishing agents on the stone.
Soapstone and sandstone are porous and will absorb most liquids, which can leave a stain, change the
appearance, or result in odd odors when warm. If you accidentally break a stone, contact your dealer for a
replacement.
Grill Height Adjustment
The convection air grill height is adjustable if necessary. The grill rests on three screws – tightening, or
loosening the screws changes the grill’s height and fit.
Jack Screws
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Hearthstone Quality Home Heating Products, Inc.
Heritage Model 8091 Pellet Stove
Maintenance
Glass Replacement Procedures
WARNING: DO NOT OPERATE THIS APPLIANCE WITH THE GLASS PANEL REMOVED, CRACKED, OR
BROKEN. DO NOT SUBJECT THE DOOR TO ABUSE, SUCH AS STRIKING OR SLAMMING SHUT. ONLY A
QUALIFIED SERVICE PERSON SHOULD REPLACE THE GLASS PANEL.
Door Gasket
Glass Clips (8)
Glass Gasket
Glass Pads (8)
Glass
Door Frame
Figure 1: Front Door assembly
1. Follow the instructions included with the replacement glass kit.
2. Remove the door.
3. Remove the screws from the glass clips (use penetrating oil if necessary) – lift the clips off the glass. Set
aside for reinstallation or use the new clips, and pads provided with the replacement glass kit.
4. Carefully lift the damaged glass out of the door and discard.
5. Remove any remaining glass and old gasket material.
6. Clean the screw holes and place a small amount of anti-seize compound in each one.
7. Place the gasketed new glass onto the door. Ensure sticker is on the exterior face of the glass.
8. Important! Center the glass and ensure that the edges of the glass are parallel with the edges of the
opening.
9. Check glass position again (centered, and parallel), then screw the glass retainer clips on the door using a
th
crisscross pattern. Tighten the screws no more than 1/8 of a turn after they seat. The glass will break at
this point if not positioned correctly.
10. Apply a light film of anti-seize lubricant on the door’s hinge pins if needed.
11. Install the door.
12. After 5 or 6 fires, check the glass clip screws, and retighten if necessary.
Required Glass Kit: Part Number: 90-58900 (Glass with gasket applied). Use only 5mm Ceramic IR, or
Neoceram IR glass. Contact your Hearthstone dealer.
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Hearthstone Quality Home Heating Products, Inc.
Heritage Model 8091 Pellet Stove
Troubleshooting
Most errors and issues are due to a lack of required maintenance, or cleaning. Using the instructions on the
following pages should resolve most issues. If an operation error is detected, the user interface flashes, and
displays a message. If the message prompts the unit to shut down, a >I/O< notice will follow the text of the
message. To acknowledge a message, press and hold the power button for approximately 5 seconds, if the
process associated with the message is complete, the stove will return to OFF Mode. At this point, normal
operation may begin again if all conditions are satisfied.
Display Messages:
Display
Problem
Possible Causes
Solution
No Pellets (code F04)
Temperature in
firebox unexpectedly
dropped, or set point
never reached
Pellet fuel level too low
Refill hopper
Inferior, or wet pellets
Clean out hopper, and auger – refill with
premium, dry pellets
Clean the auger. Follow the procedure
in Maintenance section of this manual.
Close hopper door
Auger jammed
Hopper door open
No Ignition
- (code
F01)
Required pellet
ignition temperature
not achieved during
startup – firebox
temperature too low
Dirty Stove
Preform a Level 4 Cleaning (see page
28)
Inferior/wet pellets
Consult your Hearthstone dealer for a
recommended pellet type and storage
Clean auger
Clean burn pot
Auger clogged with fines
Burn pot full of ash or
clinkers
Ash pan full and ashes
contacting bottom of burn
pot
Auger was completely
empty and did not refill fast
enough
Restricted air intake, or
outside air intake required.
Burn pot installed
backwards
Reset and start again. When the auger
is empty, it may be necessary to add 1
cup of pellets to the burn pot prior to
starting the unit.
Check both and verify they are closed
completely, and sealing properly
Close hopper door
Clean venting – also check heat
exchanger for flyash, or soot buildup
Inspect ducting. Remove blockage.
Install outside air intake
Install burn pot so ignitor hole is
towards the rear of the stove
Ignitor failed
Check wiring. Replace igniter
C-Fan (convection fan)
setting above +5
Reset program. Do not adjust C-Fan
setting.
Convection fan not working
Service the unit.
Convection fan clogged
Clean the convection fan. Follow the
procedure in the Maintenance section
of this manual.
Remove any blockage from top of
stove. Check for lint or hair on screen.
Front door, or ash pan open
Hopper door is open
Blocked exhaust venting
STb
Initiated (code F03)
Firebox/heat
exchanger
temperature too high
Empty ash pan.
Top grill blocked
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Hearthstone Quality Home Heating Products, Inc.
Heritage Model 8091 Pellet Stove
Display
Problem
Possible Causes
Solution
Flame
Sensor –
(code F06)
Room
Sensor –
(code F07)
Temp sensor in
firebox is
malfunctioning
Communication
between room sensor
and stove interrupted
Flame sensor not working
Reset the unit using the power switch
and contact your dealer if the problem
persists.
Check the rear room sensor connection
at the rear of the stove or the
connection on the inside of the room
sensor.
Replace room sensor.
Room sensor unplugged
Sensor malfunction
Too Little
Air – (code
F09)
Not enough air flow
through firebox
(monitored by
sensors in inlet pipe)
The front door or ash pan
open
Inlet or exhaust venting
blocked.
Excessive interior negative
pressure
Door gasket worn or
missing
Exhaust blower clogged
Dirty stove
Poor air flow, or exhaust
fan speed too slow
Cap Open
Hopper sensor not
engaged.
Note: The cap open error
causes the auger to stop
and will starve the stove for
fuel if not addressed
quickly.
Hopper open
Pellets on gasket seal
Hopper overfilled
Hopper door not sitting
correctly on hinges.
Sensor magnet dislodged.
Flue Gas
Fan Faulty
– (code
F05)
The signal has
stopped from the
exhaust blower
Check both and verify that they are
closed completely
Inspect all venting. Verify there is no
blockage. Clean Venting, Check stove.
Install outside air inlet.
Check gasket using the dollar bill test
outlined in this manual (see page 29).
Replace gasket if necessary
Clean the blower. Follow the procedure
in the Maintenance section of this
manual.
Preform a Level 4 Cleaning (see page
28)
Replace 3” exhaust venting with 4”
If everything checks, out and problem
persists – increase exhaust fan speed
Close hopper door
Clean off seal
Remove some pellets
Check that the slots on the hopper door
are fully engaged and the set screws
are tight
Remount magnet on bottom of hopper
door.
Sensor malfunction
Replace sensor
Exhaust blower not working
Service the unit.
Exhaust blower sensor wire
disconnected
Exhaust blower clogged
Service the unit.
Clean the exhaust blower. Follow
procedure Maintenance section of this
manual. Blades must move freely.
Page 33 of 38
Hearthstone Quality Home Heating Products, Inc.
Heritage Model 8091 Pellet Stove
General Issues:
Problem
Possible Causes
Solution
Burn pot is overflowing.
Burn pot needs cleaning
Remove excess ashes, clinkers, and live
coals from burn pot
Ignition did not occur
Clean burn pot
Ensure burn pot installed with ignitor hole
towards rear
Ignitor failure. Service the unit.
Dirty stove
Preform a Level 4 Cleaning (see page 28)
Stove feeding pellets without
ignition
Turn off stove. Dump pellets into ash pan.
Restart stove.
Poor quality or wet pellets
Consult your Hearthstone dealer for a
recommended pellet type and storage
Too much restriction in the
venting
Clean intake and exhaust venting
Burn pot clogs too quickly
or pellets are partially
burned (less than 24
hours of operation)
Increase the exhaust fan speed
Replace 3” exhaust venting with 4”
Fire has gone out
Excessive negative pressure in
the house
Burn pot is not seated correctly
Install an outside air intake.
Ash pan too full and ashes
contacting bottom of burn pot
Empty ash pan.
Exhaust blower clogged
Clean exhaust blower. Follow procedure in
the Maintenance section of this manual.
Room temperature satisfied
(display reads STOP)
Stove in a cleaning cycle (display
reads CLEAN)
No, or low fuel in hopper
Normal operation
Too much restriction in venting
Clean intake and exhaust venting
Increase exhaust fan speed
Replace 3” exhaust venting with 4”
Decrease fill time. When the hopper is open
the auger does not turn, which starves the
fire of fuel
Service the unit.
Hopper opened too long
Auger motor or exhaust fan
failure
No power to the stove
Visible, or the smell of
smoke
Excessive negative pressure in
the house is causing exhaust
vent leak, or door gasket not
sealing properly
Power outage
Burn pot must be in direct contact with the
steel surface of firebox around the
perimeter of the pot. Clean floor of firebox.
Normal operation
Fill hopper with fuel
Check circuit - supply power to the unit
O
Seal venting with 500 F RTV silicone.
Install outside air intake
Replace gasket
Normal operation. Will dissipate when
remaining pellets in hopper are consumed
Contact you Hearthstone Dealer for battery
back-up options
Page 34 of 38
Hearthstone Quality Home Heating Products, Inc.
Heritage Model 8091 Pellet Stove
Problem
Possible Causes
Solution
Low heat output
Excessive soot on heat
exchanger
Follow procedure in the Maintenance
section of this manual.
Poor quality, or wet pellets
Consult your Hearthstone dealer for a
recommended pellet type and storage
Dirty stove
Preform a Level 4 Cleaning (see page 28)
Stove unplugged, or electrical
circuit is off
Power outage
Ensure stove is plugged in to an active
circuit
Contact you Hearthstone Dealer for battery
back-up options
Check fuse on back of stove
Display not working
Connection between mother
board and display not working
Display malfunction
Check wire connections between mother
board and display
Replace display
Page 35 of 38
Hearthstone Quality Home Heating Products, Inc.
Heritage Model 8091 Pellet Stove
Replacement Parts & Optional Accessories List
PART
NUMBER:
STONE:
1941-210
1941-215
1941-220
1941-225
DESCRIPTION:
HOPPER DOOR SOAPSTONE
FRONT VERTICAL SOAPSTONE
FRONT HORIZONTAL SOAPSTONE
SIDE POLISHED SOAPSTONE
CASTINGS:*
2010-910
2010-915
2010-925
2010-930
2010-955
2010-997
2310-990
2010-995
2010-970
2310-655
2910-000
2910-005
2910-010
FOOT
ASH DOOR
BOTTOM
CORNER SIDE LEG
FRONT DOOR HANDLE
HOPPER DOOR HANDLE
TOP
TOP GRILL
FRONT DOOR
ASH PAN DOOR HANDLE
BURN POT
BAFFLE: UPPER
BAFFLE: LOWER
STEEL:
5000-095
5000-096
5090-011
5090-016
5090-069
5090-070
5090-071
5090-072
5090-073
5090-074
5090-075
5090-060
5090-078
5090-076
5090-077
5090-017
5090-018
5090-019
5090-021
5090-022
5090-060
5090-061
5090-063
5090-064
5909-020
5909-061
5909-070
5909-080
5909-095
5909-220
BEARING: SINTERED,16MM ID
BEARING: SINTERED,10MM ID
PAN: ASH
FRAME: OUTER ASH BOX
SCREEN: OUTLET GRILL
LOUVER: CIRCULATION AIR
SECONDARY HOPPER HINGE PIN
LEFT HOPPER DOOR HINGE
RIGHT HOPPER DOOR HINGE
HOPPER EXTENSION
HOPPER DOOR
FRONT DOOR FRAME
DOOR: SECONDARY HOPPER
FRONT TOP SUPPORT
REAR TOP SUPPORT
RETAINER: FRONT OUTER STONE
RETAINER: FRONT INNER STONE
FRAME: FRONT STONE
FRAME: INNER SIDE STONE
FRAME: OUTER SIDE STONE
FRAME: DOOR, FRONT
HOLDER:LATCH: FRONT DOOR
LATCH: FRONT DOOR
HINGE: FRONT DOOR
SIDE COVER
AIR INLET PIPE
EXHAUST FAN HOUSING
AIR WASH
IGNITER FERRULE
HOPPER: CABLE CHANNEL
PART
NUMBER:
GASKETS:
3110-056
3110-057
3120-021
3160-070
3160-080
3160-390
3160-391
3160-392
3160-396
3160-397
DESCRIPTION:
GASKET: ROPE,1/4”,BLK,AD
GASKET: ROPE,3/8”,AD,NON-CORE
GASKET: GLASS CLIP
GASKET: TAPE 5/8” X ¼”
GASKET: TAPE,3/4”x1/16”,AD
GASKET: FEEDER TUBE
GASKET: CONTROL BOARD
GASKET:3/8"X 1/8"FLAT KNIT BLK 1/4"AD SP
GASKET: MTR HOUSING KNOCKOUT
GASKET: INLET TUBE
MISC:
3120-220
3120-221
3200-101
3900-184
4700-0795
5090-080
5210-3080
5240-145
5240-146
5532-012
5909-050
6400-40465
7000-037
7211-951
7211-967
7211-970
7300-000
7300-005
7300-010
7300-015
7300-020
7300-025
7300-030
UPPER BAFFLE CERAMIC HEATSHIELD
LOWER BAFFLE CERAMIC HEATSHIELD
SATIN BLACK HIGH TEMP PAINT
WOODEN KNOB
MAGNET
SERVICE TOOL
ROD: HEAT EXCHANGER CLEANING
ASH PAN CATCH SPRING
ASH PAN CATCH KNOB
PALLET MOUNTING CLIP
FLAME SENSOR
OWNER’S MANUAL
WIRE HARNESS
CONVECTION FAN ASSY
EXHAUST FAN MOTOR
AUGER MOTOR
MOTHER BOARD
AIR FLOW SENSOR
CONTROL BOARD
IGNITER ELEMENT
HOPPER SAFETY SENSOR
TEMP SAFETY LIMIT SWITCH
FLAME SENSOR THERMOCOUPLE
KITS:
90-56925
90-58900
90-70900
90-73900
90-76900
90-76901
WIRED ROOM SENSOR
GLASS KIT
HOPPER DOOR SUPPORT KIT
FRONT DOOR HANDLE KIT
LOWER BAFFLE KIT
UPPER BAFFLE KIT
* Part numbers: use 2010 for Matte, 2020 for Brown Majolica.
Heritage Pellet Stove Model 8091.
Manufactured and Warranted by:
Hearthstone Quality Home Heating Products, Inc.
317 Stafford Ave,
Morrisville, VT 05661
www.hearthstonestoves.com
Page 36 of 38
Hearthstone Quality Home Heating Products, Inc.
Heritage Model 8091 Pellet Stove
Safety Label
Page 37 of 38
Hearthstone Quality Home Heating Products, Inc.
Heritage Model 8091 Pellet Stove
Customized Set Up Data:
Page 38 of 38