Coleman Evcon DGATO56BDD


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Old 10-20-09, 02:54 PM
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Question Coleman Evcon DGATO56BDD

This unit is flashing 4 lights which I have determined is bad limit switches.I replaced both switches and it is still having the same problem. The problem is the furnace lights and runs but the burner shuts off before the desired temperature is reached and blows cool air. Any help appreciated.
 
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Old 10-20-09, 04:38 PM
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Sounds like your limits were doing their job.
Probably low airflow or a bad heat exchanger.

Is the air filter and evaporator coil clean?
Have you determined which limit was locking out with a meter?
 
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Old 10-20-09, 05:01 PM
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Voltmeter testing to make sure the thermostat still is calling for heat - and that the pressure switch is passing current through it after the fire goes out, can eliminate possibilities, or help hone in on some. You can also jump 2 pressure switch wires together to see if it stays going, for a temporary test. [You can't leave it that way though, as it is a possible safety hazard!]
 
 

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