I have a SF-42 RV gas furnace that is not working. The blower runs about 10 seconds and then shuts off. I cannot hear the gas valve opening or the ignitor “clicking”. My research shows it might be a faulty sail switch. Is there a test to confirm this? Can the sail switch be replaced without removing the furnace. It is on a 2010 Cardinal. Thanks.
Not ridiculously hard to pull it out but not fun either. When I had this problem I ordered a new sail switch and pulled the furnace out. The sail switch seemed to be clicking and working but it seemed to me that it was too straight. So I bent it a little more and shoved the furnace back in. That was 2 years ago and it's been working fine ever since. And I still have a backup sail switch. Don't know if this will work for you but sometimes something small can drive you nuts.
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