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Old 01-03-2011, 04:26 PM   #1
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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

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Last edited by avatar2k; 01-03-2011 at 04:28 PM. Reason: weird characters
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Old 01-03-2011, 04:37 PM   #2
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Model Number


the model n umber is: C35 SD

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Old 01-03-2011, 05:04 PM   #3
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picture


Please see attached pic of lit pilot...
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Pilot doesn't stay lit-photo.jpg  
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Old 12-07-2015, 11:18 PM   #4
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Nobody ever answered my question... :-(

How hard is it to replace the gas valve? I replaced the thermocouple and still no luck.
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Old 12-07-2015, 11:26 PM   #5
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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?
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Old 12-07-2015, 11:30 PM   #6
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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 :}
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Old 12-07-2015, 11:31 PM   #7
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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.

thanks!
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Old 12-07-2015, 11:48 PM   #8
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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.
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Last edited by user_12345a; 12-07-2015 at 11:54 PM.
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Old 12-08-2015, 04:07 AM   #9
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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.
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Old 12-08-2015, 05:46 AM   #10
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What's pilot gas pressure? Have you removed and cleaned the pilot assembly?
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Old 12-08-2015, 07:51 AM   #11
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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!
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Old 12-08-2015, 07:54 AM   #12
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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.
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Old 12-08-2015, 11:21 AM   #13
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... 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?
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Old 12-08-2015, 03:22 PM   #14
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Very well could be the gas valve.

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