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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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Here, here the problem. The furnace kicks on, ignites,

Customer Question

Hi, here
JA: I'll do all I can to help. How long have you been dealing with this?
Customer: Hi, here the problem. The furnace kicks on, ignites, flames for about 45 second, then shuts down. It is an older York model. When it shuts down, the LED starts a sequence of 4 red flashes. The guide on the door says this indicates a High Aux or Overspill open. After about 2 minutes, the LED goes out, the igniter comes back on and the cycle starts again.
JA: Did you check the furnace's filters?
Customer: Yes. They are only about a month old. They are a bit dirty so I've temporarily removed them to help trouble shooting. It didn't help.
JA: Do you plan on doing the work yourself?
Customer: If I can.
JA: Anything else we should know to help you best?
Customer: Not that I can think of.
Submitted: 8 months ago.
Category: HVAC
Expert:  airheatman replied 8 months ago.

Can you give me the complete model number on the furnace?

The number on outside of furnace is just a series.

Actual model will be on a label on inside furnace panel just above burners.Remove panel to burner compartment and look inside. The model number will help me give accurate assistance for your specific unit.

Below is a link to a generic video showing where to find label with model number:

Customer: replied 8 months ago.
G8C10016MUC12G. I have a picture of it I'm attaching.
Expert:  airheatman replied 8 months ago.

OK here is the problem I have with this. The most likely cause for the flame shutting off this quickly is a dirty or defective flame sensor.

The problem is you say you are getting an open limit error code.If there is an open limit the furnace should not allow the burners to ignite period

Customer: replied 8 months ago.
that's why it's driving me crazy. I've been talking with a nephew who is an apprentice HVAC guy, googling like crazy and none of it is making sense.
Expert:  airheatman replied 8 months ago.

You may have a bad board. Do you have a meter to check the limit circuit?

Customer: replied 8 months ago.
I just checked and my meter is dead. I'll just have to attack this tomorrow I guess.
Expert:  airheatman replied 8 months ago.

Just come back to question when ready and we will figure this out

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