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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I have a York 80 that cycles off 5 times, then quits with 8

Customer Question

I have a York 80 that cycles off 5 times, then quits with 8 blinks. The inside cover lists this as loss of flame. I have cleaned, replaced, and tested the flame stick and it seems to be good. Just for good measure I also replaced the wiring connector to the flame sensor, but the issue persists.
Submitted: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

Is the 8 blink the first error you get or does it give a different code on first failure?

Customer: replied 1 year ago.
The 8 blinks is the first and only code I've ever seen it give.
Expert:  airheatman replied 1 year ago.

OK turn power off to furnace to reset.Call for heat.Watch for burners to ignite .Very first unsuccessful attempt we should get a different code.8 blinks means it has failed 5 times

8 RED FLASHES: This fault is indicated if the flame is lost 5 times (4

recycles) during the heating cycle

Customer: replied 1 year ago.
I hadn't noticed it before, but you're right there are additional blink codes...
Immediately after ignition there is a single blink (lockout caused by flame sensed), then after the flame cycles off there is two blinks (Pressure switch stuck closed). Should I be looking at the pressure switch?
Expert:  airheatman replied 1 year ago.

Yes try tapping gently on pressure switch and see if it will open.

Customer: replied 1 year ago.
OK, I gave it a few taps but it didn't seem to make any difference.
Expert:  airheatman replied 1 year ago.

Remove hose from vent motor, leave attached to switch.Suck and blow on hose and see if you hear it click

Customer: replied 1 year ago.
It seems to click properly when sucking or blowing on the tube.
Expert:  airheatman replied 1 year ago.

OK after sucking and blowing, reconnect and see if furnace will work, Should be unstuck now.