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Nat gas wall heater wont come on during nite

I have a nat gas Williams wall heater with an electronic thermostat. The heater is 15+ yrs old but works well when it comes on. Sometimes it won't come on until you touch the on/off switch on the thermostat. Just touch it, it's like your body touch completes the circuit or something? I've put fresh batteries in the thermostat and replaced the vent safety shut off device. Any ideas? Thanks

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Definatly sounds like a bad ground circuit IReplace thermostat you want it to be reliable

Posted on Dec 21, 2008

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Posted on Jan 02, 2017

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Williams wall heater 2509622. How do I keep the pilot on? It tends to turn off after it reaches the desired temperature.


WILLIAMS 2509622 OWNER'S MANUAL Pdf Download.

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Dec 08, 2015 | Williams Heating & Cooling

1 Answer

I have williams model 5009622 , my furnuce come on not stop , i think thermostat bad , i changed the new one but not kick on , i conect 2 wires then it kick on , you think that may be bad thermopile is...


Make sure to purchase a thermostat that will operate on a millivolt system the old Honeywell t-87 would work but the new T-87 replacement ones do not work. make sure the wires are not touching each other at the connection points. Hope this helps.

Jul 04, 2014 | Williams (5009622) Ceramic Gas Wall...

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Cozy gas wall heater won't ignite, pilot light is on


There are two types of igniters, spark-type or glow heater. The glow heaters wear out and crack or break and the spark-type spark gap gets fouled or dirty. Both could have electronics problems that drive the glow heater or spark systems. The Filtrete thermostat is not the issue. While rapping the unit makes the glow igniter come back together to glow again.

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1 Answer

Williams wall heater, lite pilot and heater comes on okay, but will only come off when I disconnect the thermostat?


If you have to disconnect the thermostat wire at the gas valve then it is either a shorted thermostat or a short in the thermostat wire.

If you only have to disconnect the thermostat from the wire, then it sounds like a bad thermostat, replace the thermostat

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Williams gas wall unit won't burn.


It's a burner control problem. It maybe a defect on some protective devices (pressure switch, fire detector, etc.), a blown fuse, or a board defect (busted DC supply transformer, relays, or electronic devices).

Nov 12, 2012 | Heating & Cooling

1 Answer

Installed new wall heater and thermostat and pilot is on but heater will not come on?


What about thermostat wire? What ya got 2 wires right? Touch them together she supposed to ignite the flames then after a few minutes the fan kicks in on fan models. You got the knob on the gas valve turned to the "ON" position?

If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61

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1 Answer

How do you wire the thermosat on williams wall furnace model 3509622


This heater has 2 type gas valves one valve has the thermostat built into it. No wiring needed for that puppy. Looks like this:


11_5_2011_12_12_10_am.jpg
So I am guessing that one ain't you.
Your heater must use a millivolt gas valve with the 2 wire wall thermostat. The pilot generator does 2 things. It holds the pilot on and it produces voltages that operate the solenoid and open and close the valve when the room thermostat makes contacts. So what goes wrong with these? The pilot generator will sometimes hold the pilot flame but whn the 2 wires are touched together or you tun on the wall thermostat the whole thang just dies. That my friend is a weak thermopile generator. The other thang that goes wrong is the solenoid on the gas valve is open and therefore the gas won't come on. Their is also a fuse mounted on there that melts and kills the magnet that the generator holds in for the pilot.

If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61

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1 Answer

We have a Williams wall heater that was gas/ converted to propane that is newly installed. The thermostat does not work. Any suggestions?


Assuming the pilot is lit, try jumping out the thermostat wires where they come into the valve. A paper clip would work. If it works, the problem is in the t-stat circuit.

Dec 30, 2009 | Williams 3003622 Ceramic Wall Mounted...

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