Instructions / Assembly

ManualsBrandsWilliams ManualsGas Wall Heaters35,000 BTU Natural Gas Hearth Heater with Wall or Cabinet-Mounted Thermostat

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.