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Old 12-06-2016, 06:43 PM   #1
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Angry 2007 National Dolphin 3M Thermostat/Heat issue

Hi all, has anyone had an issue with the heat system / 3M thermostat inside your coach? For whatever reason we have issues getting the heat to come on inside the coach. I have resat the program and started from scratch and am still having issues with it. If anyone has had this problem and corrected it I would appreciate knowing what fixed it. The problem seems to only affect the heat as the AC works just fine. Thank you.
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Old 12-07-2016, 03:40 PM   #2
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What model of 3M thermostat do you have? Have you checked the fuse for the furnace in the house fuse panel? The thermostat could be working but the furnace isn't.

Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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Old 12-07-2016, 04:19 PM   #3
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Try posting in the National RV Owners Forum. Someone there with Dolphin like yours can help. My Dolphin has a Duo-Therm 5 button Comfort Control I upgraded from a 4 button control.
1999 35 ft. Dolphin 5350, F53, Banks System, 5 Stars Tune, Air Lift Air Bags, Koni Shocks, Blue OX TruCenter, TigerTrak track bars F&R, Roadmaster 1-3/4" rear auxiliary sway bar, 2004 F450 Lariat Pickup 6.0 Diesel Crew Cab DRW, 4X4, GVWR 15,000, Front GAWR 6,000, Rear GAWR 11,000, GCWR 26,000,1994 36ft Avion 5er, GVWR 13,700, 2,740 Pin Weight.
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dolphin, heat, national, thermostat

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