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Old 04-06-2014, 04:06 PM   #1
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Question Dometic Furnace Surging

I have a dometic fan/ac/furnace Single Zone LCD thermostat. Recently, out of the blue, my furnace has started surging. When it is on, my lights go dim and back to bright. Also, I can hear a difference in the sound of the furnance when it is surging. Any tips or hints?
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Old 04-06-2014, 04:24 PM   #2
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Are you plugged into shore power or are you operating on battery. How old is the battery, does your battery have a good charge, have it load tested. Are the connections good and tight at the battery / disconnect? Disconnect the battery and check the connections at the distribution ctr. If you can access the blower motor try connecting it direct to the battery.
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Old 04-06-2014, 06:06 PM   #3
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I am plugged into a 50 amp service.

This just started happening one day about two months ago. I moved a month ago and in that time my father and I charged my battery when I wasn't plugged into any power. I just had my trailer parked during a movie. And two days later I moved to another trailer park. Hadn't ran my furnace in two months (was really hoping it was the RV parks power). Furnace still acting up. I looked at my owner manuals (I sure wish they'd put more information in these) I either have an atwood or suburban furnace. Ive never seen where the motor is (I also wish RV appliances were more accessible for getting to and fixing). Will keep looking into it.

Thanks for the feedback
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Old 04-06-2014, 08:57 PM   #4
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The fan runs on DC (battery) power. Could be a battery problem - low battery - loose connections at the battery -

Could also be some other DC powered device cycling on and off (water pump) causing a reduction in current available to the furnace blower. You could try pulling the DC fuses one at a time and see if that makes a difference.

There could be more "technical" problems but you can start with this.
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