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HVACguy
HVACguy, HVAC Technician
Category: HVAC
Satisfied Customers: 17
Experience:  I have 28 years experience in installation ,service, and design.
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HVAC

Furnace shuts off before reaching set temperature on thermostat

calling for heat. Furnace shuts... Show More
calling for heat. Furnace shuts down before the temperature desired is reached - later it restarts - and furnace lights - runs for a while - then shuts down after a while. Furnace starts immediately if I turn it off at the breaker switch, but then repeats the process.
Submitted: 7 years ago.
Category: HVAC
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Rick Mather, HVAC Technician
Satisfied Customers: 3634
Experience: 35 years experience, HVAC
replied 7 years ago.
This a warm air furnace it might be going off on high limit because of poor air flow check the air filter
Customer reply replied 7 years ago.

The air fiter was replaced recently. The old filter was not very dirty. This condo & furnace are only six (6) months old.

Rick Mather, HVAC Technician replied 7 years ago.
Sounds like your furnace is going off on the high limit setting. Check the fan and limit settings you might be able to turn that setting up a few degrees
Customer reply replied 7 years ago.

How do I identify these parts - then - I look for an adjustable setting?

Rick Mather, HVAC Technician replied 7 years ago.

Should be small little control with silver cover maybe 2 x 3" has dial inside with three pins attached to there temperature settings lowest is fan off next is fan on and the highest is high limit.

http://customer.honeywell.com/techlit/pdf/95c-00000s/95C-10617B.pdf

Might look like this one.

Customer reply replied 7 years ago.

I've removed a couple of panels exposing the electronics - and I don't see any components like the one in the PDF.

There's a nickle sized component located near the gas burner area. Two wires connect to it. Could this part be defective causing the burner to shut down too early? I guess I'm at the point of calling the repair person.

HVACguy, HVAC Technician
Satisfied Customers: 17
Experience: I have 28 years experience in installation ,service, and design.
replied 7 years ago.
you say condo and furnace is only six months old, are you getting air out of the vents, i don't know where you are but here it is code to have fire dampers in the supply duct right at ceiling level, good luck