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Are there any other numbers on unit? Usually one switch allows use of a remote control.
And does this switch have 3 positions?
Still looking for a manual.Not finding the GFP series in my Lennox fireplace models
Do you have a wall thermostat that controls the fireplace?
That may be why I am not seeing it listed (age)
Is there a publication number on manual?
Not finding anything by that either.The only two switches I am showing on any of the Lennox fireplaces is the blower switch and then an on off switch.Have you tried putting this switch in both positions to see if fireplace works in both positions?
Let me know what you find, I believe this switch has to do with that.