[lnguyen1]

My force air unit is manufactured from Goodman (Model CKL30-1L). The controller is on the attic. The fuses do not blow when it is switched to heat and the unit runs fine. However, when switching to A/C, all the fuses blow. Please advise for the problem.

[hvac1000]

Sounds like you have a major short in the electric going to or servicing the outside condensing unit. You will need a meter and check for shot=rt circuits. It could also be your compressor shorting out. Have you done any work to or changed anything in the unit lately?

[JackT]

A CKL30 is just AC only and if you blow the fuse when you turn it to cooling, you most likely have a problem in your condensing unit. It's probably a bad condenser fan motor or compressor.

[lnguyen1]

The unit is less than 2 years old. In the winter of 2005 when the unit was still under 1 year warranty, the heat did not work and was repaired by the builder's contractor. It has been working OK until now. I did not touch anything, excepting checking for the fuse according to Goodman trouble shoot.

[esquire1]

Check the low voltage wires on the outside of your house going to the condensing unit. Could be a dog chewed the wires or the weed eater got into them.

[sameeryande]

My force air unit is manufatured from Goodman (Model CKL30-1L). The controller is on the attic. The fuses do not blow when it is switched to heat and the unit runs fine. However, when switching to A/C, all the fuses blow. Please advise for the problem.

I've same problem. lnguyen1, you have found the solution yet?

[michaelyl99]

Looks like your contactor inside the outside ac unit is bad. You can check it with a multimeter. It will cost $10~90 if you replace it by yourself, and > $300 if you ask for the contractor.