Pilot Won't Stay Lit

Old 11-13-13, 04:13 AM
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Pilot Won't Stay Lit


I'm having a problem that I need assistance with. I have a Williamson_Thermoflow GWA-052-NS boiler in which the pilot won't stay lit. I or my HVAC tech have done the following repairs to no avail:

1. Changed the Thermocouple.
2. Chainged the Thermocouple again (just in case the first one was faulty)
3. Purchased new gas valve, replaced old valve on unit
4. Cleaned pilot housing
5. Checked electrical connections to the new valve

None of these repairs have solved the problem. My HVAC tech is at a loss too. I probably will have to call in another tech, but I wanted to post this inquiry first to see if there's anything else that I should be focusing on in order to get this pilot light to stay lit.

Thanks in advance for your time
Old 11-13-13, 04:32 PM
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Thermoflo website only has manual for spark ignited model, not for standing pilot which you obviously have. I'm guessing that it says " Series 1 " somewhere on the dataplate? or at least is does NOT say " Series 2 " .... right?

Has the tech measured the output voltage of the thermocouple?

Is the pilot flame BLUE? does it engulf the thermocouple?

Is the thermocouple RED hot?
Old 11-13-13, 05:02 PM
Join Date: Oct 2008
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I'm also at a loss. Try snugging up the thermocouple's connection to the gas valve.
Old 11-13-13, 05:59 PM
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How is your gas pressure?

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