13
TROUBLESHOOTING
This unit has on- board diagnostics. Error codes appear on the LED display on the front panel of the indoor unit in place of the temperature
display. Error codes are also displayed on the outdoor unit microprocessor board with colored LED lights. The table below explains the error
codes for both units.
Table 7—Diagnostic Codes
Display table for error status
Error name
Error definition
Error code display
Freon recovery mode
Operation status is displayed immediately
Fo
Malfunction of indoor fan
Malfunction of hardware
H6
Malfunction of middle temperature sensor of indoor evaporator
Malfunction of hardware
F2
Malfunction of indoor ambient temperature sensor
Malfunction of hardware
F1
Communication malfunction between indoor unit and outdoor unit
Malfunction of hardware
E6
Malfunction of jumper cap
Malfunction of hardware
C5
Limit/decrease frequency due to module current protection
Display through adjustment with remote controller
En
Limit/decrease frequency due to module temperature protection
Display through adjustment with remote controller
EU
Limit/decrease frequency due to overload protection
Display through adjustment with remote controller
F6
Limit/decrease frequency due to freeze prevention protection
Display through adjustment with remote controller
FH
Limit/decrease frequency due to discharge protection
Display through adjustment with remote controller
F9
Limit/decrease frequency due to AC current protection of outdoor unit
Display through adjustment with remote controller
F8
Malfunction overload temperature sensor
Malfunction of hardware
FE
Malfunction of outdoor discharge temperature
Malfunction of hardware
F5
Malfunction of outdoor ambient temperature sensor
Malfunction of hardware
F3
Malfunction of outdoor condenser temperature sensor
Malfunction of hardware
F4
Circuit malfunction of module temperature sensor
Malfunction of hardware
P7
Overload protection of compressor
Other malfunction
H3
Discharge protection
Other malfunction
E4
Overload protection
Other malfunction
E8
AC current protection of outdoor unit
Other malfunction
E5
Module current protection
Other malfunction
H5
Module temperature protection
Other malfunction
P8
Freeze prevention protection
Other malfunction
E2
High power protection
Other malfunction
L9
Lacking/inverse phase protection of compressor
Other malfunction
U2
PFC current malfunction
Other malfunction
HC
High DC bus bar voltage protection
Other malfunction
PH
Low DC bus bar voltage protection
Other malfunction
PL
Freon-lacking protection
Other malfunction
FO
Mode shock
Malfunction of hardware
E7
Non-matching between indoor unit and outdoor unit
Malfunction of hardware
LP
Read-write malfunction of memory chip
Malfunction of hardware
EE
Abnormal changeover for 4-way valve
Malfunction of hardware
U7
Malfunction of outdoor fan 2
Malfunction of hardware
LA
Malfunction of outdoor fan 1
Malfunction of hardware
L3
Low pressure protection
Other malfunction
E3
High pressure protection
Other malfunction
E1
Drop malfunction of DC bus bar voltage
Other malfunction
U3
Current detection malfunction for the complete unit
Malfunction of hardware
U5
Charing malfunction for capacity
Malfunction of hardware
PU
Phase current detection malfunction of compressor
Malfunction of hardware
U1
De synchronizing of compressor
Other malfunction
H7
Demagnetizing protection of compressor
Other malfunction
HE
Failure start up of compressor
Other malfunction
Lc
High peak current of compressor
Other malfunction
P5
Conglutination malfunction of relay of refrigerant electric heater of OU
Malfunction of hardware
A2
Refrigerator heater of outdoor unit is invalid
Display through adjustment with remote controller
A3
Malfunction of temperature sensor of refrigerant heater
Malfunction of hardware
A4
Malfunction exit tube temperature sensor for condenser
Malfunction of hardware
A5
Oil return
Display through adjustment with remote controller
F7
Nominal cooling and heating (capacity test code)
Operation status is displayed immediately
P1
Maximum cooling and heating (capacity test code)
Operation status is displayed immediately
P2
Medium cooling and heating (capacity test code)
Operation status is displayed immediately
P3
Minimum cooling and heating (capacity test code)
Operation status is displayed immediately
PO
