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RV furnace advise


Doubletrouble

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 I know we don't typically ask tech advise on RV's but......

We have a 1994 coachman 5th wheel with a non-working furnace. These 12volt furnaces aren't super complicated, just want to know I'm on the right track.

 I have tested the sail switch-good. The over limit switch-good. I hear clicking when it tries to fire, there is spark at the electronic ignitor, nice and blue. just no fire. I also checked for gas flow to the valve of the unit-good. This leaves me with a possible bad gas valve on the furnace. I had 12v at the solenoids on the valve, it just doesn't seem to open to supply gas to the burner. Does this sound correct? Am I maybe missing something before I order a gas valve? Is there a way to bench test or clean it? 

 Thanks.

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