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BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 21995
Experience:  Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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I have a coleman evcon model DGAT090BDF (in a mobile home).

Resolved Question:

I have a coleman evcon model DGAT090BDF (in a mobile home). Sometime during the night, the furnace went off. This morning I tried the ignition sequence listed on the instruction label. The combustion blower runs for a short while, then stops. The green led in the control box flashes once, which according to the label indicates an ignition failure. Can you tell me what the problem might be, or give me instructions to troubleshoot further. I am the homeowner, but I have some electrical background and have a voltmeter.
Submitted: 6 years ago.
Category: HVAC
Expert:  BillyHvac replied 6 years ago.




number one cause of fault is dirty flame sensor. Locate metal rod in front of burner with white ceramic base. Clean rod with steel wool. Get back with me with the results.

Customer: replied 6 years ago.
cleaned flame sensor with steel wool. Reassembled and still not ignition.
Expert:  BillyHvac replied 6 years ago.


Thank you..


unplug hot surface ignitor from molex connector ...set voltmeter to ohms. Real handy if you have the tone setting so meter beeps when leads touched together.


Then put meter leads on prongs going to ignitor where you unplugged it. Open means bad ignitor.

Customer: replied 6 years ago.
Ignitor reads open. To replace Ignitor, does it get replaced at the two wires outside the furnace or does it unplug from inside the heat chamber. Also, what should an ignitor cost (ballpark)?
Expert:  BillyHvac replied 6 years ago.


This is a common part available at most every heating contractor shop and available on line.


here is example -


Part number 1474-052P


Removes from burner section...very easy to replace.

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