There are probably over 100 potential reasons why they're not working. What the actual reason is... more information would be needed to determine this. For starters, the symptoms. It could be as simple as the blower not working, or it could be something much more complex.
Because it's not a heater.
Check main breakers.
The car has a new radiator and the air conditioner was serviced last year
A reverse cycle air conditioner work like normal air conditioners only in reverse, transferring heat into a house instead of outside of one. It is not an air conditioner at all, but a heater.
the air conditioner and heater are two separate things.(not connected) ;) it may have a fuse. or the it could just be bad.
No electricity
The air conditioner or heater continually runs.
If it is broken. It could be a faulty temperature blend door actuator.
the answer is air conditioner
BIOSPHERE
Start out by checking that the blower has both power and ground and if so then next check the a/c - heater controller...........
BIOSPHERE