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bph0712 01-21-2013 10:30 AM

Gas Furnace Problem
 
I have an Inter City Products gas furnace Model No NUG125BHA1. I recently replaced the blower motor but the unit continually shuts off well before reaching the temperature set on the thermastat. The auto igniter properly starts the burner, the blower then starts working. However, the burner shuts off after a few minutes but the blower continues to blow even as the air begins to cool. After a few minutes, the burner starts again and the cycle continually repeats itself. The thermastat has been checked and appears to be working properly. Any suggestions?

diyorpay 01-21-2013 11:00 AM

Clean flame sensor?

https://www.youtube.com/watch?v=I86joWL66aE

JScotty 01-21-2013 12:30 PM

Quote:

Originally Posted by bph0712 (Post 1098532)
I have an Inter City Products gas furnace Model No NUG125BHA1. I recently replaced the blower motor but the unit continually shuts off well before reaching the temperature set on the thermastat. The auto igniter properly starts the burner, the blower then starts working. However, the burner shuts off after a few minutes but the blower continues to blow even as the air begins to cool. After a few minutes, the burner starts again and the cycle continually repeats itself. The thermastat has been checked and appears to be working properly. Any suggestions?

Sounds like you're going out on high temp limit. With you having changed blowers I'd look at what speed you used, you may want to switch to a higher speed. Other than that look at filters or anything else that would restrict airflow.

yuri 01-21-2013 12:51 PM

you may want to get it inspected by a experienced Pro as LOTS of them have cracked heat exchangers or popped out rivets that hold the exchanger together.

bph0712 01-21-2013 01:19 PM

Thanks for suggestions. I will try a few and update status later.

ben's plumbing 01-21-2013 06:17 PM

agree with yuri...have furnaced inspected for damaged heat exchanger ..cracked..or rivets poped off.. inner city had problems with heat exchangers..ben sr


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