Williams 2001622A Owner's Manual page 31

Troubleshooting
8. Abnormal
operation.
9. Noisy blower.
10. Blower does not
run.
A. Delayed ignition - pilot
flame may be too low.
B. Expansion noise,
ticking.
C. Combustible gas
spillage.
D. Excessive flame roll-
out.
E. Burner is over-fired.
F. Yellow burner flame.
G. Yellow pilot flame.
A. Housing rattling.
B. Blower dirty.
C. Blower wheel bent.
A. Fan switch not set.
B. Check bearings.
Adjust pilot flame. Refer to "How to Care for Your Heater" section in this
manual.
Heater may be distorted by being vented through an uneven opening. A
restricted vent may create expansion noise. Refer to "Venting" section of this
manual.
Check vent system for a blocked flue, excessive down draft (wind) or
negative pressure in room caused by ventilating fan or a fire in a fireplace.
Heater is possibly overrated - check for high gas pressure at gas valve (see
4B).
Check the manifold gas pressure.
manufactured for elevations up to 2,000 feet.
operation above 2,000 feet.
Check burner for obstructions. Install new burner and pilot orifices.
Remove pilot orifice, check and clean.
Tighten blower screws.
Clean blower wheel.
Straighten or replace.
Select fan speed.
Add oil as outlined in "Blower Accessory Instructions".
Check the rate, this appliance is
It must be derated for