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Have a coleman evcon heating & cooling furnace froze up had ice on coil / top of unit. Husband cut the unit off to thaw out not the unit will not come back on.

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  • gotbear63 Dec 01, 2008

    mine does the same thing and it smokes sometimes and gets stuck on

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Freon (charge) is low. Contact a service man with the proper gauges to check theunit. It will have to be evacuated, nitrogen pressure tested, and then recharged.. Depending on the size of the unit, this cold be about 200-400$.

Posted on Jul 08, 2008

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Typical Thermostat Wiring for 4 or 5 wire Heat/Cool Thermostat (not heat pumps)
4 Wire Termostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
with one transformer for both units
Rc One Side of 24 volt Transformer
Rh Jumper Rc to Rh
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Rc = Red One Side of (outside) 24 volt (outside transformer)
G = Green Blower (outside transformer)
Y = Yellow Cool (outside transformer)
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COOLING ONLY Thermostat
R = Red One Side of 24 volt Transformer
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R or Rh One Side of 24 volt Transformer
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then if so does your heat work fine

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