TROUBLESHOOTING PROCEDURES. Haws 9326, 9327

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TROUBLESHOOTING PROCEDURES. Haws 9326, 9327 | Manualzz

TROUBLESHOOTING PROCEDURES

If you need any assistance from our Technical Service Department, make sure you can identify this water heater by having the model number and serial number.

Model No. ______________________________

Serial No. ______________________________

Call (800) 766-5612 [email protected]

PROBLEM

Unit does on

Display

ERROR E1

Display

FAULT F0

Display

FAULT F1 not power

POSSIBLE CAUSES

Main Power issue A1

Blown Fuse

Transformer overload

A2

A3

Action

Check main power supply voltage is within +/- 5% of nominal. Check breaker and wire size.

Check all fuses for continuity

Check circuit breaker on 24V control transformer

IF TRUE

Proceed to Action

A2

A3

A4

IF FALSE

Proceed to Action

Provide the correct supply voltage to the heater

Check voltages and elements, replace fuse

Check voltages and for failed PCB, Contactors- reset transformer

Check connection, and reset connector

Printed circuit board (PCB)

A4 Verify main PCB is plugged in at P16

Water temperature entering heater is above SETPOINT

A5

Verify supply water supply temperature is below set point.

Note - Heater will automatically engage when incoming water drops below set point.

Replace PCB

A6

Adjust supply temperature below set point

Loose PCB connection or pinched wire

Inlet thermistor failure

Outlet thermistor out of range

A6

A7

A8

Check PCB connection at P7 and check wire routing

Check thermistor for proper placement in well

Check PCB connection at P7 and check wire routing

A7

Replace thermistor

A9

Outlet thermistor is damaged or wire is cut

A9

Check thermistor, wire, or connector for damage

Replace thermistor

Heater is frozen A10

Verify supply and feed lines are not frozen

Un-freeze heater and check functionality

No change in water temperature detected

A11

Verify change in temperature by checking ACTUAL TEMP vs INLET

TEMP

Lower flow rate to allow heater to operate in range of capability

Check connection, and reset connector

Re-seat thermistor in well

Check connection, and reset connector

A10

A12

Thermistor failure A12

Thermal trip at

ECO/ Damaged wire

A13

Follow actions A5-A7

Power off, Using a multimeter check continuity at PCB P17 pins 1 and 3.

Check all wires for loose connection

A14

A13

No continuity verifies a thermal trip. Shut down power and allow to cool. Verify connector is seated

18

Display

FAULT

Display

FAULT F3

Display

FAULT F4

No heat

Flow rate is too high

A14 Check LOAD PCT for 100% load

Reduce flow rate, heater is operating outside of capability

A15

Element failure A15

Power off, Using a multimeter check continuity at between red and black wires at each element chamber

Heating Elements not modulating

A16

Verify SSR/Triac functionality by checking current draw off each

SSR/Triac by means of an amp clamp. Also verify signal wires are connected from PCB P2, P3, and P4.

A16

Ambient light is causing the optical

(overheat) sensors to trip.

A17

Air is present in the heating chamber

A18

Unit is to be operated with the cover on or (if NEMA equipped) door closed when power is applied to the unit.

Verify air is not present in the system by checking for a red led light on the heating chamber. Look between the black manifolds into the clear tube sections for air bubbles.

A18

Remove air by installing an air scrubber prior to heater, or flushing system thoroughly before use.

Check all wire connections

No continuity- replace heater element. Check water quality

No current draw- replace SSR/ Triac

Close door, or reinstall cover

Replace light sensor board

Loose /cut wire to optical sensors

Verify 5VDC is present on the last optical sensor in the chain by using a multimeter set for dc voltage at the

A19 connector P12 with one meter lead on the red wire and the other on the black wire.

Multiple dry fire conditions detected (FAULT

F2) more than 3 times

A20

Recheck actions A17-A19. Shut down power and restart.

Check A17 and A18 again

Inlet thermistor out of range

A21

Verify inlet thermistor is properly seated in thermal well

Turn-on flow rate not satisfied

Display states

FLOW ???

A22

Toggle through display to verify

FLOWRATE and TURN-ON

Power off unit, and verify no faults

A23 are found. Verify flow meter harness is seated in terminal P12 on the main PCB and at flow meter PCB

Verify inlet temperature is not below freezing, above set point temperature, or heater is piped backwards

Increase water flow rate above TURN-ON setting

Call

Haws

for support, firmware reload may be required

Call Haws for support

Replace main PCB and light sensor boards

Replace thermistor inlet or outlet or both

Check wiring to flowmeter.

If faults found reference above

Note: Error code history is not self-clearing. Unit keeps track of past errors. Error codes do not necessarily mean there is a current error.

19

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