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Old 10-16-2013, 07:38 PM   #1
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Furnace problem

The furnace in our 2012 Sabre 34RLQS is not heating properly. The fan will kick on then you can hear the burner kick in. The burner will only run for about a minute then kick off for 2 or 3 minutes, the fan continues to run. This continues all night and never warms the trailer. I can not find any restrictions in the vents, any ideas???
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Old 10-16-2013, 07:50 PM   #2
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If you have a bug screen on the outside exhaust of the furnace, try removing it.
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Old 10-16-2013, 07:51 PM   #3
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Originally Posted by okietom View Post
The furnace in our 2012 Sabre 34RLQS is not heating properly. The fan will kick on then you can hear the burner kick in. The burner will only run for about a minute then kick off for 2 or 3 minutes, the fan continues to run. This continues all night and never warms the trailer. I can not find any restrictions in the vents, any ideas???
Kinda sounds like a thermostat problem. But I'm not any expert
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Old 10-16-2013, 07:52 PM   #4
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The furnace in our 2012 Sabre 34RLQS is not heating properly. The fan will kick on then you can hear the burner kick in. The burner will only run for about a minute then kick off for 2 or 3 minutes, the fan continues to run. This continues all night and never warms the trailer. I can not find any restrictions in the vents, any ideas???
Sounds like the high limit sensor or control board to me. Definitely not normal. Needs diagnosis and fixing
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Old 10-16-2013, 07:53 PM   #5
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Wrong answer, sorry.
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Old 10-16-2013, 07:54 PM   #6
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Try setting the fan to "auto" instead of hi or low.
That would not explain the burner going on or off, but maybe the fan running...
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Old 10-16-2013, 07:58 PM   #7
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That would not explain the burner going on or off, but maybe the fan running...

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Old 10-16-2013, 08:53 PM   #8
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Interestingly, had the same problem with another RV'er. His limit switch failed which acted exactly like yours. Mine completely quit. I replaced mine with his defective one, but at least it fired and ran for about 5 minutes in the 4f temp.

Camping World wanted $23 for the limit switch, an RV center wanted $16. I purchased the first one I came too, installed it easily in about 5 minutes, worked ever since.

While this might not be your problem, always nice to have anyway just in case-- MHO.

Relative to temp out of the ducts, Camping world ran hot at 202f, but the RV center I got the upgraded one from was within limits. (Had a meter which tests temp, and is accurate). Nevertheless, better on than off in that weather if one keeps an eye on things.

Good luck
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Old 10-16-2013, 09:03 PM   #9
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Where is the limit switch located ????
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Old 10-16-2013, 09:11 PM   #10
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Could be your internal blower fan that is slipping on the motor shaft. Do you get any air blowing at heating vents when furnace is running? See diagram in attached manual.
Attached Files
File Type: pdf Suburban Furnace SF-42.pdf (945.6 KB, 38 views)
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