Troubleshooting Your Furnace - Williams 4505622A Owner's Manual

TROUBLESHOOTING YOUR FURNACE

For qualified service technicians.
ISSUE
1. Flame too large.
2. Noisy flame.
3. Yellow tip flame.
4. Floating flame.
5. Delayed ignition.
6. Failure to ignite.
7. Burner won't turn off.
8. Rapid burner cycling.
9. Burner won't turn on.
10. Not enough heat.
11. . Too much heat.
18
FLOOR FURNACES
POSSIBLE CAUSE(S)
A. Pressure regulator set too high.
B. Defective regulator.
C. Burner orifice too large.
A. Too much primary air.
B. Noisy pilot.
C. Burr in orifice.
A. Too little primary air
B. Clogged burner ports.
C. Misaligned orifices.
D. Clogged draft hood.
A. Blocked venting.
B. Insufficient primary air.
A. Improper pilot location.
B. Pilot flame too small.
C. Burner ports clogged.
D. Low pressure.
A. Main gas off
B. Defect in gas valve.
C. Defective thermostat.
A. Poor thermostat location.
B. Defective thermostat or wiring.
C. Defective control valve.
A. Poor thermostat location.
B. Defective thermostat.
A. Defective control valve.
B. Defective thermocouple.
C. Defective thermostat.
D. Defective limit switch.
A. Thermostat set too low.
B. Appliance close to thermostat.
C. Thermostat in bad location.
D. Thermostat out of calibration.
A. Thermostat set too high.
B. Thermostat out of calibration.
C. Valve sticks open.
D. Thermostat in draft.
CORRECTIVE ACTION
Reset, using manometer.
Replace.
Replace with correct size.
See Item 1.
Reduce pilot gas.
Remove burr or replace.
Look for obstructions in air path.
Clean ports.
Realign or replace burner.
Clean.
Clean.
Look for obstructions in air path.
Reposition pilot.
Check orifice, increase gas.
Clean ports.
Adjust pressure regulator.
Open manual valve.
Replace.
Replace.
Relocate thermostat.
Replace or repair.
Clean or replace.
Relocate.
Replace.
Replace.
Replace.
Repair or replace.
Replace.
Raise setting.
Move heat source away.
Relocate thermostat.
Recalibrate or replace.
Lower setting.
Recalibrate or replace.
Replace valve.
Relocate thermostat.