Question about Coleman (5040B750) Patio Heater

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I have a wall mount in my living room the thermocouple was replaced and wen it gets up to room temp and shuts down the pilot goes out any ideas on this?? it does relight but then does sme thing again

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Make sure the Bulb is in the flame for the piolet and if not bend it so it is if it still goes out if it still goes out you will have to replace the regulater as it has gone bad.

Posted on Sep 01, 2009

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1 Answer

The pilot goes out when the heater cycles


The thermocouple is not working correctly. sometimes you can clean the soot build up from it and it will work again. sometimes they just need replacing. the thermocouple is what the pilot light flame heats up when you turn on the heater. when the thermocouple gets hot it sends a 20 to 60 millivolt signal to the gas valve to activate the gas flow to the main burner.

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How does the thermocouple in a gas geyser work in a junkers wall mounted gas geyser?


Thermocouple sits in the pilot light flame and generates a small amount of electricity that tells the control that the pilot light is lit. If the pilot goes out, it shuts off gas so the place won't fill with gas and explode.
https://www.youtube.com/watch?v=igxYxhD82lU
Thermocouple What is Thermocouple How does Thermocouple work

http://en.wikipedia.org/wiki/Thermocouple
Thermocouple Wikipedia the free encyclopedia

Feb 07, 2015 | Heating & Cooling

1 Answer

Burnham boiler pilot light goes out when thermostat shuts it down


That unit uses a thermocouple 30mv or a pilot generator of 750 mv if the thermostat is a remote type and not integral to the gas valve.
A thermocouple or pilot generator makes power due to a temperature differential across the tip of the generator, if too much is impinged by the flame the generator gets hot across the entire tip, dropping power output.
You likely need a new thermocouple they are about $15 and easily replaced.

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Will not light, the pilot light comes on but when I light the knobe out to turn it to the on position the pilot light goes out.


Dirty pilot safety most likely.If dust gets into the ODS chamber the safety feature will think the oxygen in the room is low and shut down. I would try cleaning it first and if that don't do it then the thermocoupler is weak not holding when the valve is advanced to the ON position. I have some Literature HERE and a nice movie which features the safety pilot in action HERE

Jan 24, 2010 | Heating & Cooling

1 Answer

The pilot light on my gas water heater continually goes out. I can re-light the pilot and get it going. The gas burners goes on runs for awhile. I'm assuming when that when the temp hits the desired temp...


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The pilot assembly should look similar to the pic above. Depending on where you live, you may be required to hire a certified plumber to replace the parts. If not you can do it your self. Keep in mind if it's not staying lit you also need to check the thermostat and the thermocoupler before replacing the pilot assembly. There is a good chance it is just the thermocoupler going out. It is one of the first things to check when troubleshooting a pilot light problem with a gas water heater. A thermocouple determines if the pilot light is lit. If it's not lit, the gas valve fails. If that's the problem, replace the thermocouple.


  1. Shut off the gas valve on the water heater and the gas valve on the line near the heater. Remove outer and inner doors, and loosen the pilot and supply tubes and the thermocouple connections to remove the burner assembly.
  2. Step 2 Loosen the screw holding the thermocouple to the bracket. Remove old thermocouple. Bring it with you to the store to ensure you are buying the proper replacement.
  3. Step 3 Install the new thermocouple. Position the thermocouple so that the pilot flame heats 1/2 inch of the tip.
  4. Step 4 Reinstall burner assembly in the water heater. Tighten burner supply tube, pilot tube and thermocouple connections. Tighten thermocouple no more than a quarter turn more than hand-tight.
  5. Step 5 Turn on both gas valves. Check supply tube and pilot tube for leaks with soapy water. If soap bubbles, tighten connections to fix leak. Ignite the pilot light, and make sure the thermocouple tip is heating up. Replace inner and outer doors.

Jul 09, 2009 | Northern Tool Water Heaters

1 Answer

Dyna-glo parts


thermocouples you can buy from any heating spares oulet or national energy a hone well is most common for useing as a replacement

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1 Answer

Pilot lights fine, furnace fires up, when it turns off the pilot goes out


need to have at least 3 feet of vent out of the roof, if it is to low the coll air will cold soak down to the pilot and shut it down.

Nov 08, 2008 | Cozy (W352E) Heater

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