boiler not firing up. pilot light comes on then goes out


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Old 01-24-23, 09:02 PM
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boiler not firing up. pilot light comes on then goes out

I have a green mountain boiler that is about 7 years old. It's been maintenance free up to now. It has a electronic ignition autopilot light. About a week ago it didn't fire up The autopilot light came on for few seconds then went out. I cut the boiler off for a few minutes and then turn it back on. The auto pilot stated lit and the boiler fired up. The same problem happened tonight and again when I turn off the boiler and turned it back on it worked. I am trying to troubleshoot it before the problem get worse. I am thinking maybe the thermocouple is faulty.
 
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Old 01-24-23, 09:38 PM
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It's been maintenance free up to now.
Sorry.... that is incorrect.
You meant to say it's been trouble free up to now.
A boiler is not a maintenance free appliance even though most people ignore them until they fault.

You would need to post a complete model number.
Intermittent pilot systems need to be cleaned and there is no thermocouple in that one.

It's either a spark lit pilot or a hot surface igniter. Either style has a method for flame sensing.
 
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Old 01-24-23, 09:52 PM
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You are right. my wording was wrong. I an not to familiar with Intermittent pilot systems. I always had a standing pilot. I assume when you say the model number you are talking about the gas valve which is a Honeywell vr8204h1147 I believe it's a spark lit pilot.
 
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Old 01-24-23, 10:04 PM
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The model number of the boiler. It will be on an ID tag.
The part number of the ignition board would also be ok.
 
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Old 01-24-23, 10:36 PM
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Old 01-25-23, 01:39 AM
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Very nice.... and what code is it telling you ?

I know it's a Honeywell S93??
Spark intermittent ignition.
If you look at the bottom of that Supply House link you'll see what should be your pilot assy.

Yours may just have one probe.... combo igniter/flame sense

manual - pdf
 

Last edited by PJmax; 01-25-23 at 02:08 AM.
 

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