Williams 2001622A User Manual

Troubleshooting
SYMPTOM POSSIBLE CAUSE CORRECTIVE ACTION
1. Pilot will not stay lit
after following
lighting instructions.
A. Generator producing
insufficient millivolts.
Check pilot flame – it must impinge on the generator from 1/4 to 3/8-inches .
Be sure the thermocouple is fully inserted in its bracket.
B. Loose or dirty
generator
connections at gas
valve.
Clean and/or tighten the connections at the valve.
C. Generator defective.
Check the generator with millivolt meter. Take reading at the generator
terminals of the valve with the valve placed in "Pilot" position. Disconnect the
thermostat wires. The millivolt reading should be 450 millivolts or more.
D. Grounded thermostat
wire.
Remove the thermostat wires from the valve terminals.
If the pilot now stays lit, trace the thermostat wiring circuit for a ground. May
be grounded to heater, gas supply, nails or staples.
E. Defective valve. Replace the gas valve after above is verified.
2. Pilot burning - no
gas to the main
burner.
A. Thermostat not turned
to a position calling
for heat.
Set the thermostat to a position calling for heat.
B. Plugged burner
orifice.
Clean or replace.
C. Improperly wired or
broken thermostat
wires.
Defective thermostat.
Check the connections at valve terminals. If
valve operates, check the
thermostat wires.
D. Pilot generator may
not be generating
sufficient millivoltage
to open valve.
See 1A and 1C above.
E. Defective valve. Replace.
3. Burner comes "ON"
but goes OFF
before blower turns
ON.
A. Thermostat location.
Check the thermostat location. It should not be in the path of warm air
discharge from heater, near a lamp, or above a T.V. or stereo.
B. Defective thermostat. Check the thermostat calibration or replace.
4. Heater not
producing sufficient
heat.
A. Heater may be too
small for space being
heated.
Check heat sizing calculations.
B. Heater not burning at
full rate.
Check for low gas pressure at gas valve. It should be 4 inches W.C. for
Natural Gas; 10.5 inches W.C. for L.P.G. Check for blocked burner orifice.

Williams 2001622A Specifications

General

Brand	Williams
Model	2001622A
Category	Heater
Language	English