Question about Thermostats Heating & Cooling

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Main Flame will not turn on.

I have a Gas fireplace with a Sit V/v that has been running fine for many years, however, this year not so good. The pilot light is one I disconnect the Thermostat and joined the Black and White wires together still nothing, and then with the pilot on tested the Thermopile and got 0.4333 Volts. I also removed the Thermocouple from the main V/v it tested to 0.028 volts. I also disconnected the Thermostats connecting to the TP/TH and TH and placed a jumper on them still the Main gas flame stays off. Any thoughts on what else to try? Is there a a way to bypass the Thermocouple? Thanks you for any help. I hate to buy a new V/v and find out I missed something I should have checked.

Posted by William Bleasdale on

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Paul Carew

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You cannot bypass thermocouple it a saftey device ,

Posted on Nov 21, 2021

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  • 4 more comments 
  • William Bleasdale
    William Bleasdale Nov 22, 2021

    Thanks for getting back to me I realize it's a safety device I want to bye pass it just prove if it's good or bad.

  • Paul Carew Nov 22, 2021

    no you cannot do that .only way is a tester that goes inlline with the thermocouple and gives areading on a muit meter .Just change thermocouple it don't hold its the power unit then you will have to chang the valve

  • William Bleasdale
    William Bleasdale Nov 25, 2021

    Thank you once again, yesterday I removed the gas V/v and tested the thermocouple using a gas light allowing it to reach a glowing red. It showed 433 millivolts which tells me it's fine, however, I change it out, At the same time I did the same thing with the thermopile and it heated to 900 millivolts which once again is in range, however, I replaced it with anew one. The pilot light works great heating up both thermo's but still no main startup. I don't think there;s anything to do but change out the mail gas V/v. All the wiring was checked from the thermostat to the fireplace and found to be good. I also disconnected the thermostat and went direct (jumper). But nothing. Any thoughts?

  • Anonymous Nov 25, 2021

    No you have proved the valve is not working .You have done what I would have done . You coved all possiblites Nothing I can think of .

  • William Bleasdale
    William Bleasdale Nov 25, 2021

    Thank you for your time It's nice to know there's still people out there that care. I'm a marine engineer or was now retired, but still find time to teach at a small marine college when they need someone.
    Stay safe and like I said thank you very much for you input.
    Bill

  • Paul Carew Nov 26, 2021

    Thanks Bill Old school as they say now .

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My fireplace doesn't light right away, then it shuts off after a few minutes.

sounds to me like your thermocouple is loose just go to where it connects to the gas valve and tighten it most times this happens after it has been replaced, because temperature changes loosen them also make sure the pilot flame is directly on the thermocouple , sometimes dust gets in to the pilot and changes direction of the flame making it "grade the thermocouple, with the main burner on the air flow sometimes "moves the flame and the thermocouple thinks it went out and shuts down the main burner. extinguish the pilot, either blow it out with canned air, or use a q tip to reach down and dust it out then re light. should be good
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Flame Electric Fireplace Electric Fireplace Heat

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http://www.fixya.com/support/r3710316-portable_heat_flame_electric_fireplace
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Gas fireplace will not light up

If it has a pilot light, (website says it does) I suspect its the thermocouple. These are easy to change yourself and cheap, you can buy a universal thermocouple and it will be cheaper than a Napolean one. The end of the thermocouple is a fat copper pin that sits poking into a small pilot flame. The heat of the flame on the copper tells the system that the gas is burning ok so it allows more gas through. But after a few years the copper end gets covered in black charring and this slightly insulates it from the heat, so it signals to turn off the gas.
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This is a typical situation for a warn Powerpile generator. Your fireplace works by this generator generating heat from your pilot flame and converting it to less than 3/4 of a volt or 750mv. Your gas valve will eat up half of this electricity when running. So when you Powerpile gets warn it might only generate 400mv and when the gas valve turns on will bring it down below 200mv. This will start to drop once the main burner turns on and once below 150mv is no longer able to power the gas valve resulting in the main flame to go out. Minutes later the generator will build its power up again and repeat the cycle. The generator looks a little thicker than a crayon and has a red and white wire coming off it. They are easy to change but the tight spaces on a fireplace can make it very difficult.
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My fireplace wont stay lit with the glass on the min i take the glass off it will stay lit i have a good vent and it is propain could it be that there ant enough gas presure it is a heat n glo 6000 the...

The reason this is happening is that the overload switch, which is part of the safety features has gone bad. That's why the burner will only light with the glass off. The orange color of the flame from the pilot flame is normal for propane.

Unfortunately, this is not a DIY fix. If you can find a qualified service technician, that's the best way to go. As, Heat-n-Glow fireplaces are a basic, builder box line. And as such, have some quirks that other, more expensive gas fireplaces don't have.

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For the main gas valve to come on several conditions need to be met.

The system must detect a pilot light prior to turning on the main gas valve for systems with a standing pilot light (not sure what your system has) and on systems with auto igniters (spark or ceramic heat glo) the control board must detect a flame present at the main burner a few seconds after the main gas valve turns on.

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To check the vacuum swich on the blower a multi meter across the switch terminals looking for a steady "state change" as the blower runs/stops will work.
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