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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 5648
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I have a Evcon furnace, model #DGAT090BDF, I just replaced

Customer Question

I have a Coleman Evcon furnace, model #DGAT090BDF, I just replaced my thermostat. the furnace will start when I heat the house. When I try my a/c unit the a/c unit will start but the furnace does nothing. I think its the drain line that is clogged. what do you think?
JA: Did you double-check the thermostat's settings? And what about the filters?
Customer: yes and just changed filters
JA: Do you plan on doing the work yourself?
Customer: maybe?
JA: Anything else we should know to help you best?
Customer: where is the drain tray located on this furnace?
Submitted: 6 days ago.
Category: HVAC
Expert:  HVAC Guru replied 6 days ago.

Hello, one minute while I get some information together.

Expert:  HVAC Guru replied 6 days ago.

Hello and thanks for using this service! If you are a JA Member I would like to personally thank you and welcome you back! I am HVAC Guru an extremely experienced tech on the site and I try to get to as many customers as I can. NOTE it takes time for me to type research and add links so please wait for me to respond back I can only do this so fast. Secondly, I do not know your skill level so please try and let me know if I am going beyond your knowledge or comfort zone thanks! I strive for a 5 star rating from everyone especially our JA members.


Check the condensate pump to see if it is blocked. Also check the furnace control board for an error code and let me know what you find.

Customer: replied 6 days ago.
no error code, Where would the condensate pump be located?
Expert:  HVAC Guru replied 6 days ago.

ok jumper the R to W thermostat connections at the board with a paperclip and see if it starts

Customer: replied 6 days ago.
its on but the pilot light kicks the flame on
Customer: replied 6 days ago.
both furnace and a/c start but the pilot light kicks the flame on
Customer: replied 6 days ago.
ok I moved my red wire to the RC connect and put the jumper in W to R. red wire was in R connect
Expert:  HVAC Guru replied 6 days ago.

you have rcto havnde a red wire on r and rc

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