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Good Morning, I am Kevin, one of the Tech's here on JA.
You cannot keep your pilot lit or main flame?
Pilot flame is lit, but no main flame?
so the heat works for 24 hours or just the pilot?
ok, so the pilot stays on, but the burner (main) will not come on?
sounds like a control on the valve.....
You need to verify the gas pressure, not just the presence of gas, lp 11-14" WC. Verify adjusted pressure on nameplate.
It sounds like you are loosing the pressure when the main gas comes on "demand is higher"!
After you have verified that pressure, we can take it from there.
Just a note, is it bitter cold where the tank is located?
ok, just a thought...... but I have seen a lot of freeze ups at the regulator this time of year in the coldest of days. Most propane company's mix a little methane in the propane to keep them from freezing during this weather.
what is the model # ***** the problem heater?
do you know if you have a "photo eye or thermocouple" on or near the pilot assembly?
you could try changing the thermocouple, they are available from Home Depot for appr 10-20 dollars. Usually when a thermocouple is bad though, it will not allow the pilot to stay lit. This is precisely why I said I believed you had a control problem, such as with the gas valve. or if there is a regulator before the gas valve, I would check that first. Either way, you will need a manometer to test gas pressure.