Coleman-Mach thermostat error code...flashing DIFF

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thechinpen

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Feb 3, 2016
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I have a residential basement heat pump in my  '02 Winnebago Journey  system and when I turn it to electric heat, I get a flashing DIFF code on the thermostat, blows cold air then shuts off in about 5 minutes...I have none of the manuals....what does it mean?
 

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