So I have a gas fireplace that originally didn't have a fan installed. And this issue occurs whether or not the fan is connected or not.
The issue is that whenever the fan switch is placed in the on position the flame will go out if the fireplace is on, or not be able to light if it was off before.
I'm assuming it has something to do with the electric pilot, since when the fan switch is in the ON position, I can't hear the click sound that my electric pilot does. However I thought my electric pilot was battery powered (by 2 D batteries) so I don't understand why the switch would cause issues.
Also this fireplace runs on propane not NG.
Best Answer
So the batteries are only for when the house looses power. The "fan" switch actually cuts all power to the outlets under the fireplace. According to the manual, there is one for the fan, one for the pilot, and one for the REM/AUX.
According to the fan manual, it uses a temperature sensor to control the fan.
The reason the flame cut off when the "fan" switch was turned off, is that the batteries were dead despite having been new when installed last December. Since the batteries were dead, and power to the fireplace's control module was cut, it turned off the flame as a failsafe.