Trouble shooting
PROBLEM
1. Nothing works
2. Power on but system will not
function
3. Power on but indoor will not
function
4. Power on but compressor will
not function
CHECKLIST
Power supply to unit
PCB fuse
Interconnecting wiring
PCB varistor
Transformer
Re-set control switch
Handset control
Mode on hand set
Power on fan terminal (PCB)
Evaporator sensor
Connector plug
Motor overload
Faulty motor
Evaporator frozen
Motor capacitor
Room temp set point
Relay on PCB
Comp contactor
Comp overload
Indoor sensor (de-ice)
Comp internal overload
Compressor terminals
REMEDY LIST
Re-set circuit breaker or change fuse
Change fuse
Look for break in cable or loose connection
Replace PCB
Replace PCB
Re-set
Change batteries (or hand set)
Change function
No power check relay, if faulty replace
If short circuit, replace
Repair or replace
Wait to reset and check amps
Replace
Defrost and check filter/gas charge & deice
sensor
Replace
Adjust on hand set
Replace relay or PCB
If power on contactor coil, replace contactor
Reset, check amps and set point
See control functions
Allow comp to cool down, check gas
Check for good connection