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BillyHvac
BillyHvac, Journeyman HVAC Tech
Category: HVAC
Satisfied Customers: 22248
Experience:  Endorsed for unlimited heating, cooling, oil burners, boilers, refrigeration, hydronics
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I have a Coleman furnace model DGAA07780TA. The blinking green

Customer Question

I have a Coleman furnace model DGAA07780TA. The blinking green light (4 times) tells me the limit valve is open. Where is the limit valve and how do I close it?
Submitted: 6 years ago.
Category: HVAC
Expert:  BillyHvac replied 6 years ago.

 

Was/is the air filter dirty?

Customer: replied 6 years ago.
No
Expert:  BillyHvac replied 6 years ago.

 

Does main blower run?

Customer: replied 6 years ago.
Yes. We had a power outage Friday for a little over an hour. Haven't noticed heat on since.
Expert:  BillyHvac replied 6 years ago.

. Good info, that explains more.

 

Does this unit blow air down or up?

Customer: replied 6 years ago.
Up from floor registers.
Customer: replied 6 years ago.
Page 22 is a parts list and does not show location of limit switch or how to re-set.
Expert:  BillyHvac replied 6 years ago.

 

That shows you the location of the parts with description. You will notice the location of 3 and 13. I did this to assist you in locating the parts which that page does.

 

If the switch has a tiny button in the center you simply press it and hope it clicks. If no button is present, the only hope beyond replacement is to tap on the switch and see if it resets itself.

 

 

BillyHvac and 2 other HVAC Specialists are ready to help you
Customer: replied 6 years ago.
Thank you. I was reading the page below the number instead of above. Duh!!!
Expert:  BillyHvac replied 6 years ago.

 

No problem, if you need further help let me know.