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Problem with Williams gas valve P295200A

I have a Williams wall heater, the pilot light works fine, but the heater will not turn on. I thought the thermostat stopped functioning, but I've eliminated that. Silly as it sounds: tapping the gas valve a few times makes the furnace start up and do it's job, however, when it cools down again, past the indicated desired temp on the thermostat, I have to tap it again to start it again. Is there an easy/cheap solution to fix this? Can I clean it out or something along those lines?

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Posted on Jan 02, 2017

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SOURCE: williams 5009622 dual wall heater

It sounds like the gas valve has some debris in it that is causing internal relay from opening without some help. I would check and clean electrical connections on gas valve and make sure you are getting at least 24 volts to gas valve when thermostat iscalling for heat. I would also actuate gas valve several times in a row to see if it frees up any. If that doesn't help you probably need to replace gas valve. I think you will need a new valve but it's worth a try. Good luck. Thank you.

Posted on Dec 26, 2010

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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.


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The pilot goes out when the heater cycles


The thermocouple is not working correctly. sometimes you can clean the soot build up from it and it will work again. sometimes they just need replacing. the thermocouple is what the pilot light flame heats up when you turn on the heater. when the thermocouple gets hot it sends a 20 to 60 millivolt signal to the gas valve to activate the gas flow to the main burner.

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The thermocouple is bad and needs to be replaced...
The thermocouple is the copper rod that sticks up into the pilot flame and then screws into the gas valve...
they are sold by lentgh so you need to measure the old one when you go to buy a replacement...

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How do you turn the pilot light back on? This is an older model, probably about 10 years old or so.


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First, turn off the gas valve for at least 5 min and ventilate the room. Most wall heaters are lit the same as a water heater. Find a red button to push or turn the gas valve knob to the pilot position. While pressing the red button or the gas valve knob, hold a match to light the pilot flame. After it lights continue holding the knob for one or two minutes. If the flame goes out when you release the knob the thermocouple is probably bad.

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