45
TROUBLESHOOTING
This unit has on−board diagnostics. Error codes are displayed on the wired remote controller and the outdoor unit microprocessor board with
colored LED lights. Table 42 explains the error codes on both.
Sizes 18 and 24
Table 42—Malfunction Status Table
MALFUNCTION NAME MALFUNCTION TYPE
NIXIE
TUBE
Zero cross detection circuit malfunction (for indoor unit) Hardware malfunction U8
Malfunction protection of jumper cap (for indoor unit) Hardware malfunction C5
Feedback of without IDU motor(for indoor unit) Hardware malfunction H6
Indoor ambient temperature sensor is open/short circuited Hardware malfunction F1
Indoor evaporator temperature sensor is open/short circuited Hardware malfunction F2
Liquid valve temperature sensor is open/short circuited Hardware malfunction b5
Gas valve temperature sensor is open/short circuited Hardware malfunction b7
Modular temperature sensor is open/short circuited Hardware malfunction P7
Outdoor ambient temperature sensor is open/short circuited Hardware malfunction F3
Outdoor condenser middle pipe temperature sensor is
open/short circuited
Hardware malfunction F4
Outdoor discharge temperature sensor is open/short circuited Hardware malfunction F5
Communication malfunction Hardware malfunction E6
Malfunction of phase current detection circuit for compressor Hardware malfunction U1
Module high temperature protection
Viewing malfunction code through remote controller within 200s;
displayed directly on nixie tube after 200s
P8
Refrigerant lacking or blockage protection of system (not
available for residential ODU)
F0
Charging malfunction of capacitor Hardware malfunction PU
High pressure protection of system Hardware malfunction E 1
Low pressure protection of system (reserved) Hardware malfunction E3
Compressor overload protection
Viewing malfunction code through remote controller within 200s;
displayed directly on nixie tube after 200s
H3
Indoor unit and outdoor unit do not match Hardware malfunction LP
Malfunction of memory chip Hardware malfunction E E
Wrong connection of communication wire or malfunction of
electronic expansion valve
Hardware malfunction dn
Malfunction protection of outdoor fan 1 Hardware malfunction L3
Detection status of wrong connection of communication wire or
malfunction of electronic expansion valve
Operation status dd
Mode conflict Operation status E7
Refrigerant recycling mode Operation status Fo
X-fan Operation status AL
Defrosting or oil return in heating mode Operation status H 1
Start failure of compressor
Viewing malfunction code through remote controller within 200s;
displayed directly on nixie tube after 200s
Lc
High discharge temperature protection of compressor E4
Overload protection E8
Whole unit over-current protection E5
Compressor phase current protection P5
Compressor de-synchronizing H7
Compressor phase-lacking/phase-inverse protection Ld
IPM modular protection H5
DC bus-bar low voltage protection PL
DC bus-bar high voltage protection PH
PFC protection HC
The four-way valve is abnormal U7
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