Question about Coleman Evcon Furnace Control Circuit Board 77990-320p

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I have a Coleman Evcon Elec Furnace with the added AC Unit. The blower works great with the AC but only on & off with the heat, what could this be?

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  • Anne H Dec 01, 2012

    When I turn the wall unit to AC the blower works when the AC kicks on, when it is turned to Heat you can hear the coils getting hot but the blower will not kick on? Could this be a Relay Problem? The fan is free and turns WELL.

  • Anne H Dec 01, 2012

    Any suggestions are great! Thanks

  • Anne H Dec 01, 2012

    Also this is an Electric Unit

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Replace the sequencer...which is just a series of snap disc relays that are staged. The first snap disc should kick on the first element & low speed of blower. Depending on how many elements you have, determines how many snap discs are on the sequencer. It could be a 2,3,4, or 5 stack. Generally the coil is 24 volts.

Posted on Dec 10, 2013

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Posted on Jan 02, 2017

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SOURCE: Coleman Evcon no fan when in heating mode

Sounds like your flame proving device is not proving the flame. It is located on the last burner looks like a piece of thick wire sitting right beside the last burner. To Save you about 50 bucks service call take some steel wool and very gently clean the carbon that has built up on the surface of the device. Should only take 4 or 5 strokes.

Main blower will delay when in heating mode as to allow the heat chamber to build up enough heat to trigger the fan switch.

Posted on Nov 30, 2008

  • 146 Answers

SOURCE: My Coleman Evcon heating and air unit will not blow air

bad blower motor. recommend a new blower motor and capacitor.

Posted on May 28, 2010

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SOURCE: we have a coleman evcon

Explain the problem further as I do not understand the problem(s)

Posted on Aug 03, 2011

  • 1 Answer

SOURCE: coleman evcon blower not working properly

My Coleman Evcon ac unit,heater and blower does not work.not even the outside condenser comes on.Any ideas on what is the problem?

Posted on Aug 06, 2011

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I have a coleman Evcon model AH16-0 . I am


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
G = Green Blower
Y = Yellow Cool
W = White Heat
5 Wire Thermostat
With 2 transformers one for indoor unit
And one for outdoor unit
Rc = Red One Side of (outside) 24 volt (outside transformer)
G = Green Blower (outside transformer)
Y = Yellow Cool (outside transformer)
Rh = Blue One side of (inside) 24 volt (inside transformer)
W = White Heat (inside transformer)
COOLING ONLY Thermostat
R = Red One Side of 24 volt Transformer
G = Green Blower
Y = Yellow Cool
HEATING ONLY
R or Rh One Side of 24 volt Transformer
W = White Heat

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I have an coleman evcon furnace when i turn a/c on the outside unit will run but the inside wont run


put the just the fan on turn off the ac and the heat and just fan on make sure the blower motor works cause thats really the only thing you utilize from the furnace in the summer and let me know
then if so does your heat work fine

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