Question about Williams 2509612 Ceramic Mid-Size Heater

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The thermostat wire is loose.

After the rain, the pilot went out. I opened the door and saw that the thermostat wire is loose but I don't know where this should be connected. I had someone light the pilot for me but now I can't control it. Is there some kind of picture you can show me as to where the cable goes?

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Re: The thermostat wire is loose.

I don't have a picture, but I can help you if you have a gas valve that has 3 wire connection posts labeled TH, TP and one will have both TH and TP. If so let me know.

Posted on Jan 09, 2008

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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:

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.

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There is a thermostat which is creating the problem

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The pilot is on,, but gets no heat

Well she oughta light off with the green knob turned up all the way.
This valve has a temp control mounted in it. Once the pilot is lit you move the
knob to ON and if it is cold in the room she oughta fire off. If it don't then the valve needs to be replaced. If yours works on 24 volts and you have the knob on the on position and the thermostat is on and the transformer is working then the valve oughta fire off. If it don't then the solenoid is bad and the valve needs replacing. IF you have a pilot generator then your gas valve solenoid work off of voltage being produced by the generator. That type system is very simple. a 2 wire thermostat on the wall makes the circuit and the generator powers the whole she-bang. If the solenoid is open on the valve OR if the thermopile / pilot generator is weak then when the themostat comes on the pilot simply goes out. Let me know you need further assistance.

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1 Answer

Pilot goes out when heater shuts down and fan is running

The pilot needs cleaning and the Thermocouple connection, where it goes into the gas control valve may be loose. If you can loosen the nut on the connection with your fingers, it's loose. Finger tighten it and with the appropriately sized open end wrench, tighten it only 1/4 turn more. If that doesn't solve the problem, you need to replace the Thermocouple. But, cleaning the pilot is important. Especially, the Oxygen Depletion Sensor (ODS) which is part of the pilot.

To assist you in how to clean the Pilot, I have included a link to a demonstration on "How to Clean a Pilot Assembly".

I'm sure this will help you Troubleshoot and solve the problem. If I can be of further help please let me know.

Apr 21, 2011 | Rinnai Unvented Gas Zone Heater. 99% fuel...

1 Answer

Our pilot will lite but when we turn tha nob it will not start up

make sure you have turned the control knob to the "on" position. this is a milivolt system. the pilot make all the electricy to run the burner. make sure the pilot os blue and torch like not yellow and lazy. on the gas valve there are 3 wire connection point. one has a red wire one a white wire and the other lets say a black. with the thermostat turned down all the way jumper the red wire post to the one that doesn't have the white wire connected to is. this will by pass the thermostat. did it come on great check for loose connection didn't come on dang pilot generator may be weak and need to be replaced

Feb 02, 2011 | Williams (5009622) Ceramic Gas Wall...

2 Answers

Pilot is lit,but heater will not turn on. was working fine yesterday.

this heater runs on 750 milivolts. it is created by the pilot lite. the heat for the flame on the pilot generator makes it all happen. the pilot should be covering the generator 3/8 to 1/2" from the top. the generator is about as big as you small finger. it has the wire going to it next to the pilot gas . a dirty or loose connection will keep it from working also. it connects to the gas valve with a red and white wire.turn your t stat as low as it will go and take a wire,paper clip?, and cross the red to the 3rd screw with out the white wire this should make the burner come on,bypassing the thermostat.if that works clean the wire connection at t stat

Jan 30, 2011 | Williams (5009622) Ceramic Gas Wall...

1 Answer

Furnace not firing up...thermostat said low battery ...installed new batteries. Green (LED) light indicating power to thermostat is off. Furnace still doesn't fire up.

1) Turn the fan to on and if it runs you know that you have line
voltage to furnace and 24volts to the thermostat.

2) You could turn the furnace off remove the doors and get to the
control board. If you can find the Thermostat wires on the board
mark and remove them. If you have a typical Furnace and you
have some electrical background put a jumper wire between
terminals R and W,put the doors back on-there is a door switch
that if the panel is not put back on-it will not run. Turn your power
back on.

3) The Blower motor may come on, the induced draft blower should
come on, the glow coil should glow, the gas valve open and the
burners should come on and the unit should run.

4) If all of this happens, then you have a thermostat problem or you
have bad thermostat wires.

5) If nothing happens then you don`t have power to the furnace or the
little fuse that protects the transformer is blown.

Good Luck

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1 Answer

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Sounds like one of your limit switches lost it's wire. Look for a disc like device no more bigger then a 50 piece. You will see two wires going to that and if the wire broke take off the insulation and install new plastic sheath and re-attach. Let me know it that is helpful. ken

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1 Answer

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How old is the thermostat? Also there a limit switches at different points on that unit. If you have a volt ohm meter find the round disc like safety's and ohm them out. Take the wires off the disc before testing them. You should have a continuity should be closed they only open if unit gets too hot. Say something like 180 degree's.

A fast way to check out the thermostat is take a small diameter wire take the cover off the t-stat and jump across the R and the W on the t-stat. If the furnace comes on then t-stat bad. Let me know if this is helpfull. Ken

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2 Answers

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If the pilot flame is not strong enough, it will not tell the gas valve to open, or if the gas valve is not getting the signal to open, it won't. Check all wire connections at the thermostat and gas valve. Check ground wires. Clean the pilot light and flame rod.

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