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avatar2k 01-03-2011 04:26 PM

Pilot doesn't stay lit
i have an old WIlliams Wall Heater.

I push the brown BUTTON when its in the PILOT position and light the pilot. I hear the gas flowing from the pilot thing and put my light near by - the pilot lights. When I then try to rotate the BUTTON to the
ON position, the pilot light goes out. I tried keeping the flame on in PILOT position for an extended period in case the heating element needed a long time to warm up -- still no luck. Please keep in mind the the Thermostat is in the maximum heat position (90+).

Any suggestions? is there a part I can replace myself? should i leav it to a pro? how much would it cost to fix?

thanks in advance. larry

avatar2k 01-03-2011 04:37 PM

Model Number
the model n umber is: C35 SD

avatar2k 01-03-2011 05:04 PM

1 Attachment(s)
Please see attached pic of lit pilot...

avatar2k 12-07-2015 11:18 PM

Nobody ever answered my question... :-(

How hard is it to replace the gas valve? I replaced the thermocouple and still no luck.

user_12345a 12-07-2015 11:26 PM

Could it be a dirty pilot orifice? is the flame totally engulfing the thermocouple.

Does the flame get extinguished as soon as you stop holding the button?

Nik333 12-07-2015 11:30 PM

See if some of the similar threads down at the bottom of the page help. I'm no expert on this, just on unconscious pattern recognition :}

avatar2k 12-07-2015 11:31 PM

Hello!! thank you so much for your reply. Let me try to answer your questions:

1. yes, the pilot flame totally engulfs the thermocouple. I actually made sure the pilot flame had time to heat the thermocouple up a lot by continuing to push the pilot button 1- 2 minutes BEFORE I tried to rotate the pilot button to the "ON" position.

2. Yes- as soon as i try to rotate the button to the "ON" position the pilot flame goes out.


user_12345a 12-07-2015 11:48 PM

Turn down the t-stat all the way when you try.

If the pilot stays lit when in pilot position and not being pushed down, yet goes out when you rotate the knob to on my guess would be a bad gas valve.

there may be a way to check the voltage output of the thermocouple or power pile, whichever it is.

this is all based on what i know, not experience with wall heaters. i've never seen one, but same concept as a gas fireplace or water heater.

beenthere 12-08-2015 04:07 AM

How easy it is to change the gas valve varies with how easy it is to get to.

Not familiar with your Brand, so can't say how easy it will or won't be.

roughneck 12-08-2015 05:46 AM

What's pilot gas pressure? Have you removed and cleaned the pilot assembly?

avatar2k 12-08-2015 07:51 AM

roughneck: don't know what the pilot gas pressure is but the pilot flame is substantial when its lit (please see the picture posted on this thread above). How do I check the pilot gas pressure?

I have not cleaned the pilot assembly - how do I do that? thanks!

avatar2k 12-08-2015 07:54 AM

user_12345a: i check the thermocouple with a voltage meter by applying fire to the tip and checking the leads for current. I bought a new thermocouple and it seems to be working fine.

avatar2k 12-08-2015 11:21 AM

... the fact that the thermocouple seems to be working (and is new) leads me to believe the problem may lay with the gas valve. Does that make sense?

beenthere 12-08-2015 03:22 PM

Very well could be the gas valve.

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