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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.
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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.
http://www.irv2.com/forums/f105/
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