Coleman Evcon Presedential will not light

Old 10-15-18, 06:39 AM
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Coleman Evcon Presedential will not light

So I have a Coleman Evcon Presedential gas furnace. It is a vertical combination unit in a single wide mobile home. Pilot is lit, thermostat “trips” as it should, blower works fine in bypass, as well as the whole unit works fine for the refrigerated air mode of the combo unit. Yet it will not do anything but sit in the pilot state when set to heat. I replaced the thermocouple a little less than a year ago. Model number is 7956C856. It’s a unit that is probably 25 years old in a single wide mobile home of the same age. This is the first time I’ve tried the heater in approximately 7 months. We can have wild temperature and humidity swings here if that matters. Any help or ideas would be greatly appreciated!!
Old 10-16-18, 12:11 AM
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Welcome to the forums.

You need to rule out a defective thermostat first. You may be able to unsnap it off the wall and try shorting the R to the W terminal and see if the furnace starts then.

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