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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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Have a carrier a/c. Cooling works but heat does not come on.

Customer Question

Have a carrier a/c. Cooling works but heat does not come on. I want to try and replace the 5 amp fuse but where do I find the location in air handler so I can do so??
Submitted: 1 year ago.
Category: HVAC
Expert:  BillyHvac replied 1 year ago.


if you have cooling then the fuse is not blown in the air handler. If fuse were blown nothing would work except maybe a nonstop blower.

The air handler will have 2 where freon pipes enter...and the other a solid panel. Follow wiring into unit and that is the door to remove if you wish to.

When cooling does outdoor unit run?

Customer: replied 1 year ago.
It runs when cooling
Customer: replied 1 year ago.
Do you mean to say open the door where the freon tubes enter?
Customer: replied 1 year ago.
Please respond to my additional questions Billy.
Expert:  BillyHvac replied 1 year ago.

I apologize...your response came a hour and a half after later and i had signed off.

I do not see value in finding the fuse as it would not cool if fuse was blown.

Now, if it cools but does not heat....would likely be a defrost board issue in the outdoor unit. Would you be replacing this yourself?