I check with my neighbour - it was the fan motor in the main heat pump unit outside. It just quit.

I was off on the age - it was 5-6 years old.

The parts warranties are indeed generous - mostly 10 to 12 years; however, there is the PITA factor when they fail & the cost of the service calls that can really add up over time.

My 22 year old Lennox WhisperHeat Gas Furnace needed only one part - the electric ignitor box about 8 years ago - over its life...

TAM