OIL FURNACE TROUBLESHOOTING CHART

OIL FURNACE TROUBLESHOOTING CHART
260-315 1285 Ch8r8
4/5/06
9:36 AM
Page 274
HEATING AND COOLING SYSTEMS
housing. You can access the air blower and filter through
a metal panel on one side of the furnace. The panel is
held by either hooks or retaining bolts; slip the panel
up and off the hooks or remove the bolts and lift the
panel off. Most furnaces have switches and reset buttons
located on the motor or in a switch box outside the
furnace housing. These are usually identified with
stampings or labels, such as DISCONNECT
SWITCH, RESET, and so on. The stack control sensor,
a safety device that monitors burner operation, is
positioned in the stack and held with a series of retaining
bolts.
OIL FURNACE TROUBLESHOOTING CHART
Problem
Furnace won’t run
Burner won’t fire
Not enough heat
Furnace turns on and off
repeatedly
Possible Cause
Solution
1. No power.
1. Check for blown fuses or tripped
circuit breakers at main entrance panel
or at separate entrance panel; restore
circuit.
2. Switch off.
2. Turn on separate power switch on or
near furnace.
3. Motor overload.
3. Wait 30 minutes; press reset button.
Repeat if necessary.
4. No fuel.
4. Check tank; if necessary, refill tank.
5. Fuel line blockage.
5. Clean oil filter and oil pump strainer.
If problem persists, call a professional.
1. No fuel.
1. Check tank; if necessary, refill tank.
2. No ignition spark.
2. Press reset button on stack control,
once; if necessary, clean stack control.
If no result, call a professional. If
furnace has electric-eye safety, clean
safety; if no result, call a professional.
1. Thermostat set too low.
1. Raise thermostat setting five degrees.
2. Air filter dirty.
2. Clean or replace air filter.
3. Blower clogged.
3. Clean blower assembly.
4. Registers closed or blocked.
4. Make sure all registers are open; make
sure they are not blocked by rugs,
drapes, or furniture.
5. System out of balance.
5. Balance system; see section on forcedair system.
6. Blower belt loose or broken.
6. Adjust or replace belt.
7. Burner dirty.
7. Call a professional.
1. Air filter dirty.
1. Clean or replace air filter.
2. Oil filter dirty.
2. Clean or replace oil filter.
3. Motor and/or blower needs lubrication. 3. If motor and blower have oil ports,
lubricate.
Blower won’t stop running
4. Blower clogged.
4. Clean blower assembly.
5. Stack control faulty.
5. Call a professional.
1. Blower control set wrong.
1. Reset thermostat from ON to AUTO.
2. Limit switch set wrong.
2. Reset limit switch.
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