Hi guys!
I'm sure glad I found this website!
It's pretty cool!

I have a major problem with a horizontally-installed loop Cantherm Duo520 GSHP system installed in my father's home located at the top of ice-cold New York state near the Canadian border in 1986 - it's down to one slab
of heat left when it started with 4 sections originally.

Two slabs were turned off about 10 yrs ago when
they were no longer needed.
One was for the outdoor backyard pool while the other was routed out
to a dog-breeding kennel about the size of a 2-car garage.
The 2 remaining slabs are for half of the home (bedroom & living/dining
room areas)
The other half of this ridiculously large single-floored home w/basement
uses the Newton air exchanger for rotating the heated or cooled air.

Now...only the master bedroom slab is working and the Newton is dead.
No air moving at all...

The blower doesn't turn on anymore and the pipe is really cold just as it reaches a large canister and before it enters the Duo520 unit.
There are no lights on the Duo520 on and I hear a loud buzzing noise coming
from the blower area of the unit.
Where do I start?
I have a Cantherm Duo520 manual but it's extremely minimal in information.
There's absolutely no one within 50 miles of here that knows anything about it!
The original installer was Neil Windsor Refrigeration and was certified by Cantherm out of Montreal, Canada - but he moved out to Colorado I think.

Blower motor dead?
Compressor dead perhaps?
How come the master bedroom slab is actually working great?
What can I check?
I'd like to get at least the living/dining room area slab working again...please!

I'm good with electrical, plumbing and know how to use a multimeter...lol
Refrigeration was never my forte...
How can make sure the compressor is working correctly?
I think it was changed out of the Duo520 about 9 years ago.

I'm using the wood-stove for main heat right now but it is not sufficient enough heat to reach the bedrooms and
bathroom at the other end of the house!
I'm sorry this is my first post and it's too long already but I needed
to give you guys some idea what's going on here.
I'd appreciate it very much for help you guys can give me on this!
I'm getting really sick of chopping wood in the garage...lol