Hi I have a GTI R-3500 natural gas fireplace. ( Heat-N Glo )
The pilot light stays lit- no problem. When I select the wall switch to ON the main burner does not light.
I have jumpered the wall switch with no results.Resistance checked in wiring and is good
I checked the output of the thermopile with the pilot light selected ON and it gives a reading of above 550 millivolts
The output of the thermopile with the gas valve selected to ON is also in excess of 550 millivolts.
When I select the wall switch to ON the output from the thermopile drops to only 3 millivolts, which I assume will not open the gas valve being this low. The recommended output from the thermopile with the wall switch ON should be in excess of 100 millivolts.
Is it normal to have a faulty thermopile give a high reading ( in this case above 550 millivolts ) and when under load ( as in opening the gas valve ) to fall this low.