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Old 01-24-2018, 01:24 AM   #1
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Allegro Breeze (DP) Furnace Problem

Hello. Our 2015 Tiffin Allegro Breeze furnace suddenly stopped working. Same problem for electric and propane.
Symptoms:
1. Blower turns on for approx 5 minutes, but air never gets warm.
2. Furnace did work two weeks ago.
3. Same problem for gas and electric (50amp shore power).
4. No circuit breakers appear to have tripped.

Does anyone know what might be wrong?
- David
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Old 01-24-2018, 04:56 AM   #2
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Propane tank valve on ? Propane in tank ?
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Old 01-24-2018, 03:04 PM   #3
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If you verified gas is actually working (burner on stove turned on) and it still acts the same way, it's likely the sail switch inside the furnace. If the furnace thinks the fan is not working, it will not ignite and will shut down the way you are seeing.
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Old 01-27-2018, 01:56 PM   #4
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Problem solved. The issues was the "Sail Switch" inside the fan housing that verifies air is flowing before turning on the flame. My sail switch was either gunked up or reseating the connector resolved the issue. Had to pull off the cover and exhaust port from the outside of the RV in order to access the blower.

Shout-out to Troy Gurley whose YouTube video: 'Suburban SF30 Sail Switch Problem' provided the solution.

Thanks @twinboat and @topdownman for your suggestions. Always start with the basics!

P.S. I also spoke with Tiffin customer service who suggested that the furnace 'overlimit switch' may have gone bad. That appeared much more difficult to access and would have required pulling the furnace out of the RV as far as I can tell, so I'm extra glad I found Troy's video before attempting that.
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allegro, furnace, sail switch, suburban heater, tiffin breeze



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