AT wrote:
I have a Lennox 10 ACB Compressor system. I noticed today that the Air
compressor (external) was making a humming sound and the fan was not
working. The rest of the Air Conditioning system seems to be working
fine.

Any suggestions on how to resolve the above issue.

Regards

AT
Hi,
Time to check contactor, and capacitor(s).
Don't get yourself electrocuted.