DIYbanter - View Single Post - Heat Pump/Air Handler went out completely

Moe Jones

wrote:
Before I decide who to call on my problem I'd like to get some sort of
idea what the problem is...

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.

Thanks

Phil

It could be the transformer in the furnace.

just be careful that you do not hurt yourself if you try to repair.

If you think it is under warranty then call out the ones who installed it or
last worked on it.
--
Moe Jones
HVAC Service Technician
Energy Equalizers Inc.
Houston, Texas
www.EnergyEqualizers.com