I have a Miller propane furnace with hot surface ignition. Most of the time it starts and ignites fine, but sometimes the furnace will start but will not light until you open the door and shut it so it resets.I have replaced the Honeywell single try hot suface igniter with a new 3-try igniter. It was working fine for the first day, but I had to restart it that night.I have watched to see if it was the igniter. The igniter heated up and glowed but when the gas valve should have opened,it didn't. Think maybe it is a gas valve problem?

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Originally Posted by Uvburn

I have a Miller propane furnace with hot surface ignition. Most of the time it starts and ignites fine, but sometimes the furnace will start but will not light until you open the door and shut it so it resets.I have replaced the Honeywell single try hot suface igniter with a new 3-try igniter. It was working fine for the first day, but I had to restart it that night.I have watched to see if it was the igniter. The igniter heated up and glowed but when the gas valve should have opened,it didnt. Think maybe it is a gas valve problem?

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Need a little more info.

M3RL080?

Gas pressure readings at manifold?

Age and has it been serviced recently?

Cmf 80 pg
Model pbg-2-di
3 years old mobile home furnace

If there is a flame sensor try to clean it with steel wool(don't use sand paper)

This should provide reliable flame sensing.