I have a Goodman furnace that is about a year old. It works for some time blowing hot air and tries to reach the temperature set on the thermostat. After some time trying to reach the target it cuts off. When I look at the furnace, I see a red light flashing four times. Would replacing a filter and placing it incorrectly in the direction of flow cause this problem?

Answer

No, I don't see the filter being in backwards causing this issue. I'm not sure what is but that I don't think is.

Updated on January 8, 2018

Original Article:

How to Figure Out What is Wrong With Your Furnace
By Dan Robbins

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