This is my first post here, although I have been looking around for some time now to help troubleshoot my issue here... (I hope im posting in the right spot here)
I have a Duo Therm gravity heater that was working last year, but refuses to work correctly this year (it did have some trouble last year). This heater has millivolt generator
Last year, I would have to turn the pilot ON when the thermostat was ON, so that a quick whoosh of gas (that only comes out when the operator knob is turned from PILOT to ON) would instantly light
the burner. (everything worked fine from there on out. it would start, turn-off and re-start with no problems)
This year, (with the thermostat on) no matter how long I hold the pilot in, I cannot turn the operator knob from PILOT to ON.
I can get the pilot to light
,,.. as long as the thermostat is set to OFF. (this is how you are supposed to do it per the instructions). I turn the operator knob from PILOT to ON. that the pilot is on, I turn the thermostat ON, and there is a loud CLICK/Bonk noise. I believe this is the Thermo-magnet safety valve shutting closed. (the instructions state that a safety valve will close when the pilot burns low, goes out, or becomes unstable.
I did get the pilot to turn ON with the thermostat ON a few times this year. One time it seemed to be burning low, and the flames were yellow.
This made me think that there is not enough oxygen
I cleaned a bees nest out of the exhaust already, (i thought this was the problem originally, as i got it to light
up afterwards) and have attemped to clean the air intake with a plumbing snake, (although i cannot see where the tube connects to on the inside of the flame box, so i cannot be sure that it is clear)
Any thoughts on what else i can check? I feel as thought the Thermophile is working because I can get the Pilot to stay ON when the thermostat is OFF. But for some reason, as soon as I turn thermostat ON, the pilot will not turn ON.