One morning while in Heat mode my Heat Pump simply stopped running all together, not even a temp readout was on the digital thermostat. Just nothing. I could not get the Air Handler fan to blow by setting it to do so at the thermostat.
There is an 10 year old air handler in the attic and a 9 month old heat pump outside.
No circuit breakers were tripped. I am able to get to the attic air handler and can see that its two breakers were not tripped either.
I checked out at the heat pump and there seems to be power going to the unit, (verified by a non-contact voltage probe) yet the small green "Power" light inside the Tempstar unit isn't lighting up.
There are 2 breakers serving the Air Handler, I suppose one is for the backup heat strips, the other for the fan motor. There is one breaker serving the Heat Pump outside. All these circuits seem to be ok as they leave the Main circuit box. They never tripped at the time of the event.
That is about all I can decipher at this time as I really don't want to open the sides of the Trane Air Handler to check the wiring inside.
I am just stumped at what it could be, especially as the Honeywell thermostat simply reads blank (its a 24 volt, no battery). I tried using a small lamp tester across all the contacts inside the thermostat contacts but non of them seem to be 'hot'.
The heat pump is a new replacement, 8 months old. The Air Handler is about 10 years old.
Any ideas about what could have gone so wrong, so quickly?
What seems strange is the blank Thermostat and the Blank Heat Pump. The 'who to call dilemma' is between the Installer of the new Heat Pump and the company who installed the Air Handler (no warranty left) as I've learned that you may as well just call the company you expect to install any replacement unit first because otherwise you will just be wasting a 100$ service call which won't be applied to the price of any new equipment installed.
I just am looking for some sort of clue as to what might be wrong before I call them. The house has an older heat system (elec baseboard) so there is no huge rush.