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Old 06-20-2022, 12:56 PM   #1
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Dometic furnace

We have a 2021 sunset trail 253rb. Over the weekend the furnace wouldnít ignite. Furnace is under the fridge with no outside access to the front with all the wiring.

Iíve got propane to the stove and water tank which is after the furnace. Everything is working fine there. Iíve got power to it and itíll run the blower for about 15 seconds then itíll shut off. Iím leaning towards the sale switch either being faulty or dirty.

Since I have no access from the front if I pull the furnace do I need to disconnect my outside exhaust port? Or does it just slide out?
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Old 06-20-2022, 03:10 PM   #2
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We have a 2021 sunset trail 253rb. Over the weekend the furnace wouldnít ignite. Furnace is under the fridge with no outside access to the front with all the wiring.

Iíve got propane to the stove and water tank which is after the furnace. Everything is working fine there. Iíve got power to it and itíll run the blower for about 15 seconds then itíll shut off. Iím leaning towards the sale switch either being faulty or dirty.
Since I have no access from the front if I pull the furnace do I need to disconnect my outside exhaust port? Or does it just slide out?
There are a number of pretty good YouTube videos on the subject. If you don't hear the distinct 'click' of the gas valve, I would first suspect the sail switch, especially if you have pets (hair).
Any work done on the units with the small exhaust duct requires removal of the furnace from the inside. It's not too tough, except for lying on the floor for us old guys. You can usually leave the exhaust alone, but it's a little tougher lining up the duct on reinstallation.
I would go through troubleshooting first though. You don't want to take it out if you don't have to.
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Old 06-20-2022, 03:24 PM   #3
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There are a number of pretty good YouTube videos on the subject. If you don't hear the distinct 'click' of the gas valve, I would first suspect the sail switch, especially if you have pets (hair).
Any work done on the units with the small exhaust duct requires removal of the furnace from the inside. It's not too tough, except for lying on the floor for us old guys. You can usually leave the exhaust alone, but it's a little tougher lining up the duct on reinstallation.
I would go through troubleshooting first though. You don't want to take it out if you don't have to.
Canít hear that click sound. I did pull it out and check behind the switch and there was a little bit of pet hair. Put it back together and same issue. Iíve got another sail switch coming since itís cheaper then taking it to a dealer.
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Old 06-20-2022, 03:37 PM   #4
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Canít hear that click sound. I did pull it out and check behind the switch and there was a little bit of pet hair. Put it back together and same issue. Iíve got another sail switch coming since itís cheaper then taking it to a dealer.
You can check the sail switch and also the thermal switch for continuity and proper operation with a meter. They are in series with each other, and the wires are easy to find and access. The Dometic wiring diagram in the service manual is a very useful tool.
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Old 06-21-2022, 01:24 PM   #5
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Replaced the sail switch today and all is working perfectly now. Thanks for the help
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