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Where can I find a thermocouple or gas regulator for model # QN300TYLA Serial #357700501

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You'll probably need your local gas company to order it for you. They will most likely want to install it. If they don't they should want to do a leak test on the house.

Posted on Nov 06, 2010


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Charmglow ventless lp gas fireplace model CGL300TQ pilot light wont stay lit, how do i know if its thermocouple or regulator?

if the therocouple has packed up pilot light will not light thermocouple has long small diameter pipe leading to a larger end this needs to be above the pilot flame also for safety have a small bowl of soapy water with a brush wet the nut with soapy water in no bubbles appear then try lighting heater thermocouples don't last that long

Jan 26, 2013 | Rheem 36" Water Heater Thermocouple Kit

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I have a Reliance water heater - 40 gal Model

In my first 15 years as a plumber I never saw a pilot light issue on a gas WH that a new thermocouple didn't fix. Since the government mandated a redesign of the fire box, I've seen three that nothing ever fixed - two Whirlpools and one (my usually ultrareliable) AO Smith - including replacing the entire burner assembly and the regulator. And I've heard of many others.

Check the thermocouple connection for tight. (Don't strip.. threaded soft metals.)
Check the microvents on the bottom ? of the burn box for dust, even if it is new.
Call Reliant and demand new units until you get one that works.
Try another model. Consider a 52gal electric.

I've always recommended gas over electric, and AO Smith and Rheem were my recommendations (and "Reliants" were "lumber yard" water heaters. Sorry.)

Since the mandated redesigns, I don't really have a "proven reliable" model to suggest. I increasingly believe the restricted air flow design is the ultimate culprit, including any changes to the thermocouple/regulator construct to accommodate the restricted air flow design. Just my hunch.

Offered for what its worth. -- plumber in Indiana.

Jan 10, 2011 | Reliance Natural Gas Water Heater Control

1 Answer

The pilot light doesn't stay lite.when you release the pilot button.Williams natural gas,model#3501922serial#27048194

Probable thermocouple failure. If the pilot light jet is visible, the thermocouple is located in the path of its flame. It could require adjustment if it isn't being reached by the flame during lighting but that is rarely the case.
Look for an object close to the end of the pilot light that is 1-2" long and ~ 1/4 inch in diameter. It will have a metal tube attached to the end farther away from the pilot light jet and is routed to the regulator.
The tube is part of the thermocouple so it is only screwed onto the regulator.
These are often easy to replace and if you take a picture of the pilot light end or remove the whole assembly, call a hardware store near you or a dealer in gas appliances to ask if they have a compatible one in stock. All of these devices produce the same voltage so only the physical dimensions are of an real importance. A shorter or longer end isn't critical but you may have to adjust the bracket holding the thermocouple so the new one is bathed in the flame of the pilot light.
The threaded fitting on the regulator end is rarely different so it shouldn't present a problem. The mounting itself is an electrical connection so don't break the brass fitting by over-tightening, there is no gas at that point.
Here are some photos of typical thermocouples:

Dec 04, 2010 | Williams 3501922 (NG) Gas Compact Heater

1 Answer

Gas furnace in older trailer house. I can get the pilot light to come on but it will not stay on. I put a new thermocoupling in place. when I letgo go of the piolet light on the regulator the light...

make sure your thermocouple is located in the direct path of the pilot flame. if not the thermocouple will not heat up enough to send the low voltage signal to the gas valve.

Nov 27, 2010 | Coleman Heating & Cooling

1 Answer

Need 800 phone # to order thermocoupler for fireplace

try national energy they are on line you can buy parts there

Nov 18, 2010 | Procom QN300TYLA Compact Heater

2 Answers

I want to convert a QN300TYLA natural gas unit to


Oct 08, 2009 | Procom QL300TYLA Heater

1 Answer

Pilot light will stay lit Lennox G8D2-82

You may need to replace the Thermocoupler. It screws into the gas regulator and the sensor end is set in the flame of the pilot light. You can get one at any appliance parts store. The Thermocoupler simply feels the heat of the pilot light and sends a very small amount of voltage to the gas switch that opens when your thermostat calls for heat. If the pilot light isnt lit, no voltage from the sensor and no gas can be released by the regulator.
Anyone can replace one. Just find the tip that sits in the the pilot flame when you try to ignite the pilot light. Follow it down to the regulator and unscrew it. There is no gas involved. It is Ultra Low Voltage. No danger.
Be sure to turn off the power to the unit before you begin removal. Take it to the parts store along with your furnace brand and model number. If you see any identifiers on the regulator, note them and take them with. When you replace it be sure to have the sensor end up in the flame of the pilot.

Sep 29, 2009 | Heating & Cooling

1 Answer

Need thermocoupler for GTI Gas Technology fireplace insert

Contact your nearest Heat-N-Glo dealer for part #446-511 thermocouple. If you need a thermopile thats part #2103-512. To find your nearest dealer go to

Dec 27, 2008 | Leisure HOMEPRIDE Electric Fireplace...

2 Answers

Adjustment for in house ng regulator

Don't adjust the regulator. Problems with the regulator are rare, and if you don't have the special pressure gauge you cant safely adjust it anyway. Your problem is with the thermocouple. This shuts off the gas valve if the burner goes out. Replacements can be found at Home Depot.


Dec 15, 2008 | Kenmore 71510 / 71511 / 71512 / 71514 /...

1 Answer

Thermocoupling burns out every 7-10 days?

If your thermocouple is literally burning out, then have the pilot assembly checked and clean, check the orifice and the gas pressure to the pilot. Make sure the orifice size is correct for what type of fuel you are using (liquid propane or natural gas). Worst case you could have a gas valve or regulator going bad. Please have this done by a qualified service technician. I hope this helps.

Nov 30, 2008 | Heating & Cooling

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