Heating, Air Conditioning, Fridge, HVAC/amana air command 90 furnace


limit switch keeps tripping, I push the button back in after I let it cool down 45 min it will work fine for about 3 hours then it trips again. Any suggestions on what I can check or what the problem may be?

Hi Teresa,

If your talking about the high limit switch, your air flow may be low. Make sure you have a clean filter. Another possibly is the furnace is over firing. You would have to call someone out to test this. If you could check the blower motor wires make sure it is running on med speed. If you want to trouble shoot this further, send me the model#.

Heating, Air Conditioning, Fridge, HVAC

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Jim S.


I can answer questions on gas or electric furnaces, ac units and heat pumps. I don't work on boilers,chillers,or home appliances.


I have been in the HVAC trade for over 35 years. For the past 15 years I have owned my own business. I am semi-retired so I can answer questions in a timely manner.

I attended trade school for 5 years on weekends and evenings. This was very hard to do, but well worth it!

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