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Old 12-31-2015, 01:24 PM   #15
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After listening to this now multiple times, I'm not hearing the definetive "tick, tick, tick" that I'm used to with an igniter. What I THINK I'm hearing is the valve opening and gas coming in but not being ignited. Also, pretty sure its a SF-42FQ, due to it being a "bottom duct".
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Old 12-31-2015, 01:29 PM   #16
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Our furnace refused to light last March. I talked to a tech and he told me to check the fuse where the hot wire connects to the circuit board. It seems there is a plastic flexible tube that the hot wire connects to, which then connects to the circuit board. That tube has a fuse built in. He said just bypass it until I could get a new one. I did. Furnace lit.

I found the flex fuses at CW and now carry spares.

Check that first.
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Old 12-31-2015, 01:33 PM   #17
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I should mention that this type fuse is used on our water heater but I had no idea there was one on the furnace as well.
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Old 12-31-2015, 01:53 PM   #18
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I will check that fuse once I get furnace pulled out. Working on that now. I will update thread once I find the problem.
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Old 12-31-2015, 02:40 PM   #19
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It sounds like your system is working properly, it's just not lighting. On mine the igniter will click when it's worn out but it wont spark. I would recommend getting access to the igniter to see if it's sparking.
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Old 12-31-2015, 05:48 PM   #20
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Today's update: Got the unit pulled out and found the model# SF-35FQ. Plan to order the ignitor online since no one is open here and the one that was didn't have what the part. I'll replace that and see what happens. As it sits currently, I wired in a switch to run the blower manually. I have a space heater in the cubby with it and can run warm air into the vents/belly if wanted/needed. Thanks for all the suggestions and help! Truly appreciated.

FWIW, this model can't be diagnosed in the camper. You can't get to any of the switches, board, etc with it in the cubby and surrounded by the metal cage.
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Old 12-31-2015, 06:54 PM   #21
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Need help with furnace

So the furnace lights for a minute then goes out right after ? Shuts down after 3 attempts? Check the flame sensor if it doesn't sense the flame it cuts the propane off.. Also check ur control board for any burn marks which would cause the same issue.. Had a burnt board before and had that issue good luck
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Old 01-01-2016, 12:46 AM   #22
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The sail switch must close to trigger the igniter. The high temp cutoff switch must also be closed in order for this to happen. My high temp switch was replaced after only about three days of use. It was pretty easy to get to, as was the sail switch. However, I took it in, as it was under warranty.

Best of luck!
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Old 01-10-2016, 08:22 PM   #23
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Just in case anyone else finds this thread. Ended up being the gas valve. Was getting 12v at the valve but it wasn't opening.
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