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Why is Keeprite gas furnace kicking on and off?

Customer Question
Why does the Keep-rite gas...

Why does the Keep-rite gas furnace kicking on and off without actually heating? I also see a green light blinking. I came down this morning and the floor was wet so I think the humidifier must have overflowed and was causing frequent start/stops during the night. The filter seems to be a bit damp.

Submitted: 2 years ago.Category: HVAC
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Answered in 10 minutes by:
1/4/2016
HVAC Technician: Tim H., HVAC Professional replied 2 years ago
Tim H.
Tim H., HVAC Professional
Category: HVAC
Satisfied Customers: 3,972
Experience: Experienced in all aspects of HVAC, both residential and commercial.
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Hi, I'm Tim and I'm an HVAC expert here to help answer your question(s). Please provide all the information I ask for since I'm not onsite.

Please give me full model number. How many blinks?

Once you determine that, check for a blink code legend and let me know what it says?

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Customer reply replied 2 years ago
Where would I get the model number?
HVAC Technician: Tim H., HVAC Professional replied 2 years ago

Inside the top door on a tag. Also, flash code legend is typically posted near the board.

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Customer reply replied 2 years ago

Says international comfort products model number C8MPN100F1481. Code is a heartbeat bright/dim - Normal operation or no previous diagnostic code.

HVAC Technician: Tim H., HVAC Professional replied 2 years ago

That is not an error code. Just a heartbeat. Sure you are calling for heat?

Check your thermostat. Be sure you are calling for heat. If your thermostat says you are and still the heartbeat at the furnace, you may have a bad thermostat.

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Customer reply replied 2 years ago

Ahh, upon further review if I look longer the heartbeat stops and then I get 3 flashes, which is pressure switch open when should be closed on single stage models low closed on two-stage. I'm guessing it's the pressure switch that is faulty.

HVAC Technician: Tim H., HVAC Professional replied 2 years ago

Could be or a blocked intake if this is a high efficiency model.

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Customer reply replied 2 years ago
How could I know?
HVAC Technician: Tim H., HVAC Professional replied 2 years ago

Actually I just saw your model number and this is an 80% furnace, so it would not have an intake. So, yes, it could be a bad pressure switch or kinked pressure switch tubing, as a couple possibilities.

Make sure inducer motor is running and that pressure switch hose is connected/not kinked.

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