Pilot light stays on, main flame wont stay on

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Old 03-26-20, 08:13 PM
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Pilot light stays on, main flame wont stay on

RE: Lennox Serefina Gas Heating stove ( 7years old)
SIT Gas valve & SIT Millivolt Pilot
Remote control gas valve module
Thermopile replaced 2 years ago, service person retired

Pilot stays lit, impinges on thermopile. Flame goes almost completely around but does extend past the thermopile as illustrated in the installation manual. I tired to increase the flame from the gas valve screw that is marked pilot, cant get it to go any higher.

Vacuumed & cleaned the pilot assembly with solvent and scotchbrite pad.
After cleaning, Worked perfect for a few minutes then main flame went out, pilot stayed lit.

If I manually switch the remote receiver on and off ( not the hand held) I can relight the stove but it goes out after a few minutes. Doesn't matter if I leave it in the on position or the remote position or if set to a specific temperature in the "thermo" mode on the hand held. When I toggle the on off switch sometimes I hear a solenoid click and sometimes I don't, but even if hear the click I don't necessarily get the stove to light. Usually, if I set the receiver to remote, and toggle on off at the handheld, the stove lights, but goes out as usual after a few minutes. I'm new to this forum, hope this isn't too much information, but being stuck in the house with the current health advisory, I have lots of time.

Any advice is appreciated. I'm an experienced mechanic but not an HVAC do it yourselfer. Is this a job I can safely do?

Thanks,
Sam.
 
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Old 03-26-20, 08:51 PM
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Welcome to the forums.

Try cleaning the pilot orifice.
 
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Old 03-26-20, 09:10 PM
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Thank you Pete. Does this require any disassembly? Can I use the "straw" on a can of Brake-kleen and blow into the four ports on the head of the pilot? Naturally with the gas supply off and time for the solvent to evaporate..
 
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Old 03-26-20, 09:19 PM
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I didn't realize this was a fireplace. Thread moved to fireplace forum.

Unfortunately the orifice is in a tiny brass plug down below the pilot flame.
It will be a pinhole that needs to be cleaned out using a small pin or piece of wire.

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Old 03-30-20, 10:33 AM
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Pete, are you referring to the brass "wire retainer" that span the pilot just above the red square you added?
Thanks,
Sam
 
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Old 03-30-20, 10:57 AM
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The picture is just a generic one I use.
There will be a brass like nut with a tiny hole in it.
Not sure exactly what you have but it will be a tiny hole the controls the gas flow to the pilot flame.

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Old 04-04-20, 06:36 AM
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Hi, check this link out for testing a millivolt gas valve,
https://www.google.com/search?q=mill...OW_Qat2oW4BA86
Geo
 
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