[dbertke]

Hi I have a TEMTEX gas fireplace that the pilot light wont stay lit after you stop depressing the manual gas valve. I believe the thermocouple sensor is not working, however I don't know how to test to ensure that is the problem.

 

[how]

First check if the pilot flame is enveloping the tip of that thermocoupler.

The thermocoupler end connected to the gas valve can be unscrewed and it's DCMV measured when the pilot flame has been going for a minute. A complete test requires an adapter to be placed between the gas valve and the thermocoupler to measure the DCVM while it's screwed in place.
Fireplace thermocouples are cheap but can often be a very space restricted repair.

 

[Poparoach]

id say for 15.00 just change it ..clean pilot burner make sure thermocouples in pilot flame you shud be good to go ..not likly its the gas valve ,,, let us know how y make out gl

 

[carmon]

its more than likely a power pile.. .. they are not so cheap....

 

[Poparoach]

yes yur right my bad was going off info given by post ,,, there 30.00 here

 

[hvac benny]

its more than likely a power pile.. .. they are not so cheap....

I believe it is the thermocouple as the pilot won't hang in when the valve is let go. I would suspect the powerpile if the pilot hung in, but the main burners didn't fire. Of course, both should be properly tested, and the OP will need a meter and adapter to do it.