CONNECT SERIES SERVICE MANUAL
11
ENGLISH
Troubleshooting
No
No
Yes
Yes
Low Pressure error
High Pressure error
Start
Start
Repair the leak &
charge refrigerant
Recover refrigerant
and recharge
Lack of refrigerant?
Excessive refrigerant?
Check PCB and
Low Pressure Switch
Check outdoor
unit coil
Replace pressure
switch
Check for refrigerant
system restrictions
Replace PCB
Low Pressure Error (UUC148WC* unit only)
High Pressure Error
CN17 is the low pressure switch connection. When
this connection is open, the unit will show low
pressure error. When this connection is closed, unit
will be normal, or it is PCB problem.
CN13 is high pressure switch connection. When this
connection is open, the unit will show high pressure
alarm. When this connection is closed, unit will be
normal, or it is PCB problem.
Switch
Closed
Switch
Open
Check PCB and
pressure switch
Replace pressure switch
Replace PCB
Switch
Closed
Switch
Open
