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Old 09-21-2019, 03:28 PM   #1
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Gas Furnace

The Suburban Gas Furnace SF35 in my 2008 Tiffin worked great on the previous 3 trips however this last trip it was dead. Checked the thermostat and it is fine. I did find a fuse that was burned and when I tried to replace it it immediately blew too.
Any suggestions of what I should look for before taking it to a service co?
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Old 09-21-2019, 05:50 PM   #2
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My guess is a seized fan motor.
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Old 09-22-2019, 08:18 AM   #3
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Quote:
Originally Posted by craigtoups View Post
The Suburban Gas Furnace SF35 in my 2008 Tiffin worked great on the previous 3 trips however this last trip it was dead. Checked the thermostat and it is fine. I did find a fuse that was burned and when I tried to replace it it immediately blew too.
Any suggestions of what I should look for before taking it to a service co?
I had the same experience and found that the fuse blew as the slide in which the furnace was located was extended the last 10 or 15 cm. I had to run another 12 volt feed to the furnace.
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Old 09-22-2019, 08:30 AM   #4
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get a service manual, and pull the furnace. check for shorted connections. ive found on my sf35, the wires that ran to the rear sensor had gotten under the bottom of the furnace and worn thru. also. could be a seized motor.
either way, getting it out will simplify the diagnosis.
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Old 09-22-2019, 08:40 AM   #5
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Quote:
Originally Posted by craigtoups View Post
The Suburban Gas Furnace SF35 in my 2008 Tiffin worked great on the previous 3 trips however this last trip it was dead. Checked the thermostat and it is fine. I did find a fuse that was burned and when I tried to replace it it immediately blew too.
Any suggestions of what I should look for before taking it to a service co?
Mud wasps love to build nests in the intake to the blower. You may have have a nest or other obstruction that is preventing the blower from turning. The furnaces are pretty easy to remove and work on, but if disconnecting the propane supply bothers you, then take it in for service.
If you are handy, there are several U-tube video's that show you how to troubleshoot and repair the furnace and the service manual is available for download on the Suburban website.
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