If you have not found the problem yeat, it IS the thermocoupling( or pilot generator(same thing))
You may test by placing a multimeter on the red and white leads coming to the gas valve. you do not need to disconnect the leads first but you can
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check to make sure that the poilet lite flame is touching the tip or top of the thermocouple. the pilot lite needs to heat up the thermocouple so that the thermocouple opens the gas to the main gas log. a cold thermocouple shuts off the gas to the main gas log or gas burner and a hot thermocouple opens the gas to the main burner. the pilot lite flame must be touching the thermocouple to heat it up. pilot lite orface needs to be clear to let the pilot flame gas through with enough pressure so that the little flame can reach & touch the thermocouple. Pilot lite gas feed tube must be clear to let gas through. Use compressed air or a fine sewing needle, or even carb cleaner to clear out orface hole and gas feed line to pilot lite.
important!! WARNING: if you use carb cleaner,make sure all the carb cleaner is dry,soaked up with paper towell or kleanex tissue and blowed out with compressed air , because carb cleaner can burn just like gasoline; so any carb cleaner must be compleatly gone before you attempt to lite the pilot lite.
Hi there. You must continue to hold the knob in for at least 30 seconds before releasing. If the pilot still goes out, the "thermocouple" is bad. It's the little tube in the pilot flame. To replace, remove the main burner assembly/pilot. You can get a thermocouple at any hardware store. Ask questions while you are there. Thanks Paul
A polit generator produces about 750 MV without a load. Under load it will drop to about 200-250 MV. If the system is working don't worry about it. If the system is not working replace the pilot generator and retest. Pilot generators usually go bad slowly.
take millivolt reads while main burner is on.i suspect you will see a drop in voltage until you get to point where it will no longer operate burner(around 200mv).if this is the case you probably have poor pilot characteristics due to dirty pilot,pilot out of adjustment ,obstruction or insufficient gas pressure
the thermocouple not only keeps the pilot on but lets the gas valve know its okay to open on a call for heat, remove your thermocouple and clean it with a fine grit sandpaper and if this doesn't work replace it all together.
If the pilot flame is not strong enough, it will not tell the gas valve to open, or if the gas valve is not getting the signal to open, it won't. Check all wire connections at the thermostat and gas valve. Check ground wires. Clean the pilot light and flame rod.