Old-Biscuit wrote:
Your LP Regulator is NOT providing correct system pressure which is 11" WC .
That's not very likely to be the problem.
In the other thread the OPmentioned she said;
"We turned the heater on about 10:00PM and all was running well. I woke up about 4AM to a strange sound and the heater blowing cold air. The strange sound was the heater trying to light, but couldn't. There was no propane getting to the burner. I tested the cook stove burners and sure enough, they wouldn't light.
We came home this morning and when I got home, I checked the cook top burners and sure enough they lit - and I turned the furnace on and it worked fine.
It turned right on, the burners lit and it was blowing warm air. I went out about 30 minutes later and again, I could hear the burners trying to light - unsuccessfully - and the heater was blowing cold air."
The issue comes and goes based on temperatures, regulator settings don't change.
I'm sure we will find that the OP has butane, or a butane / propane mixture in their tank. As temperatures drop the amount of vapour being produced drop, when the temperatures go back up the amount of vapour does too.