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If the pilot stays lit on a wall furnace, why won't the heater light when turn on thermostat?

I have a williams furnace, gravity vented wall furnace, natural gas and the pilot light is lit- and remains lit. However, no matter setting I adjust the wall thermostat too the heater will not light at all.

Building Supplies
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3 Answers from these members:
Manage My Life
Mine (Williams 5009622) did the same thing and, after a couple of hours of research, found the answer to get mine going. What I had to do is: 1) Unscrew 3 mounting screws (1 on top and 2 on inside bottom by gas valve assemply) and pull cover/housing back. 2) Turn on thermostat. 3) Press/hold RED reset button (upper top left side of heater assembly; two wires were connected to it) for about 2 seconds. It immediately fired up. I hope this helps.
by Manage My Life
March 1st, 2012
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