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airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 7737
Experience:  Furnace, A/C and heat pump specialist.
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I have a ducane gas furnace model 80g1 which is not working,

Customer Question

i have a ducane gas furnace model 80g1 which is not working, i have replaced the transformer and now have a blinking red light on the control board which is flashing 7 times which it says means "lockout due to no ignition" , does that mean the board is bad or is there a test i can do to verify the ignitor is working and just replace it ?
Submitted: 9 months ago.
Category: HVAC
Expert:  airheatman replied 9 months ago.

Turn power off to furnace and thermostat off. Then power back on and tell me if you still have error code.If not call for heat and see how far in sequence it goes.

The normal sequence of operation:

Inducer vent motor comes on

Pressure switch closes

Igniter lights

Burners ignite

Main circulating blower comes on

If furnaces fails anywhere in the sequence we should get an error code by blinking lights on the control board. Turn power off and back on, then call for heat.tell me how far in that sequence it goes and what error code is on first failure We will go from here.

Customer: replied 9 months ago.
ok
Expert:  airheatman replied 9 months ago.

We will go from here.

Customer: replied 9 months ago.
after powering everything down and then calling for heat, the furnace responds, goes through a cycle, the circulating fan runs for about 3 minutes and then i get 7 flashes
Expert:  airheatman replied 9 months ago.

Sounding like maybe a bad board if it is igniting but board says no ignition.

Customer: replied 9 months ago.
ok i will replace it, thanks
Expert:  airheatman replied 9 months ago.

Let me know how it goes.