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OIL FURNACE TROUBLESHOOTING CHART
Problem Possible Cause Solution
Furnace won’t run 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.
Burner won’t fire 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.
Not enough heat 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 forced-
air system.
6. Blower belt loose or broken. 6. Adjust or replace belt.
7. Burner dirty. 7. Call a professional.
Furnace turns on and off 1. Air filter dirty. 1. Clean or replace air filter.
repeatedly 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.
4. Blower clogged. 4. Clean blower assembly.
5. Stack control faulty. 5. Call a professional.
Blower won’t stop running 1. Blower control set wrong. 1. Reset thermostat from ON to AUTO.
2. Limit switch set wrong. 2. Reset limit switch.
Problem Possible Cause Solution
Furnace won’t run 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.
Burner won’t fire 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.
Not enough heat 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 forced-
air system.
6. Blower belt loose or broken. 6. Adjust or replace belt.
7. Burner dirty. 7. Call a professional.
Furnace turns on and off 1. Air filter dirty. 1. Clean or replace air filter.
repeatedly 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.
4. Blower clogged. 4. Clean blower assembly.
5. Stack control faulty. 5. Call a professional.
Blower won’t stop running 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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