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Hi my name is Robert.....
Yes if pressure was to low it would affect the furnace. The pressure really should be checked at the furnace with a manometer with another appliance running you should have 11" of water colmun. Go to the main tank and shut the valve, slowly open it back up sometimes if the main valve is opened to fast the regulator can lock up and you might not get the proper pressure.
IF you are blocking the vent off and it is lighting off then I might blow out the exhaust port out really good and make sure it is not plugged up, make sure all your ducting on the furnace is secure. I might also have the circuit board tested to make sure it is not part of the problem, the electrode will sense the presence of flame and send a signal to the circuit board to shut down if it does not see the flame, if it is lighting off and shutting down then it could be the board. Most RV shops have a special tester for that..... Robert
If it is not a LP problem I would next have the circuit board tested to make sure it is good and not shutting down the flame. I also might pull the gas orifice and soak it in alcohol. Make sure there is also nothing inside the burner chamber, sometimes bees, mud daubers can get inside and cause problems, have seen that a few times. Air flow is crucial for these to work properly..... Robert
understand, I might pull the unit and give it a good cleaning and make sure all the gaskets (if you have any) are not leaking, sometimes you will find covers that require gaskets. You would have to pull the furnace from the casing to access. Not sure of your make and model
One thing also I would verify your battery voltage when this is happening, make sure you have at least 11 volts DC...
I might pull that out and inspect it on a bench and clean it all out, if something was inside it would cause this issue, I would also clean that gas orifice and see what happens...