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Rick
Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 19495
Experience:  40+ yrs. experience as a licensed oil & gas technician.
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have a coleman evcon model #dgat070bdf. when i try to start

Customer Question

have a coleman evcon model #dgat070bdf. when i try to start furnace the control box flashes three signals,says my combustion air switch faild to close. put in a new one last year the plastic one with the plastic hoses,worked fine for a season. is it the relay to the top flue that opens and closes when the furnace cycles? it will work sometimes but when it doesnt it humms the top one to the flue pipe that gets fresh air? it opens and close freely when moved by hand but does not cycle proprly,please help. [email protected]
Submitted: 7 years ago.
Category: HVAC
Expert:  Rick replied 7 years ago.
HiCustomerbr />
Is the "relay to the top flue" a small fan?
Customer: replied 7 years ago.
no it is not a small fan,the small fan is on the right side of the furnace and it cycles,the one i am talking about is the one at the top of the furnace that has a 4 inch inlet that a butterfly damper opens and closes as furnace cycles
Expert:  Rick replied 7 years ago.
I'm not familiar with this unit. I'll open the question to the other experts
Rick, HVAC Supervisor
Category: HVAC
Satisfied Customers: 19495
Experience: 40+ yrs. experience as a licensed oil & gas technician.
Rick and other HVAC Specialists are ready to help you
Expert:  BillyHvac replied 7 years ago.
hello, I have seen these motors both on the exhaust and intake. Is yours definitately on the intake pipe?
Customer: replied 7 years ago.
yes i think it is on the intake side,because it has nothing to do with the exaust flue which is the large flue pipe,i think. i dont know what the small 4 inch pipe is for but that is where the buttery fly flap that opens and closes as the furnace cycles .i can call you and give more detail if need to. it just wont cycle because three flash on control board says fresh air switch faild to close
Expert:  BillyHvac replied 7 years ago.
Is this hooked into a fresh air system with alarm and attic fan?
Customer: replied 7 years ago.
no attic fan it may help to know this is in a double wide home 2000 model
Expert:  BillyHvac replied 7 years ago.

while looking uo your info I found this I wanted to forward to you-

 

http://www.dgatprogram.com/

Expert:  BillyHvac replied 7 years ago.
you are very welcome. Thank you