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MAINTENANCE
4
4.1 Error Codes
No.
Error
Code
Malfunction
Name
Origin of
Malfunction
Signal
Control Description
1 E1
High pressure
protection
High pressure
switch
When unit detects the high pressure switch is cut o for 3
seconds successively, high pressure protection will occur.
All the loads (except the 4-way valve in heating mode) will
be switched o. In this case, all buttons and remote control
signals except the ON/OFF button will be disabled and
cannot be recovered automatically.
2 E2 Freeze Protection
Evaporator
temperature
sensor
If detected that the evaporator temperature is lower than
the protective temperature value after the unit has been
running for a period of time under cooling or dry mode, the
unit will report this fault, in which case the compressor and
condenser fan motor will stop. The unit will not run until
the evaporator temperature is higher than the protective
temperature value and the compressor is stopped for 3
minutes.
3 E3
Low pressure
protection
Low pressure
switch
If it is detected within 30 seconds successively that the low-
pressure switch is cut o while in On or Standby state, the
unit will report low pressure protection. If the fault occurs
successively 3 times within 30 minutes, the unit cannot be
recovered automatically.
Low refrigerant
protection
/
If the unit reports the system is lacking refrigerant within 10
minutes of turning on the unit, the unit will stop operation.
If the fault occurs successively 3 times, the unit cannot be
recovered automatically.
Refrigerant
recycling mode
/
If the unit enters refrigerant recycling mode through special
operation, E3 will be displayed. After exiting refrigerant
recycling mode, the code will disappear.
4 E4
Compressor
high discharge
temperature
protection
Compressor
discharge is too
high
If the unit detects that the discharge temperature is higher
than the protective temperature value, the unit will report
high discharge temperature protection. If the protection
occurs over 6 times, the unit cannot be recovered
automatically. Switch o the unit or re-energize the unit
after cutting o power to eliminate this protection.
5 E6
Communication
malfunction
Communication
between
mainboards
If the mainboard does not receive data from the
other mainboards, communication malfunction will
be reported. If there is a communication abnormality
between the display board (wired controller) and the unit,
communication malfunction will also be reported.
6 E8
Malfunction of
Evaporator Fan
Motor
Evaporator fan
motor
If the unit does not receive signal from the evaporator fan
motor for 30 seconds successively when the fan motor
is operating, evaporator fan motor malfunction will be
reported. In this case, the unit can automatically resume
operation after stopping. If the malfunction occurs 6
times within one hour, the unit cannot be recovered
automatically. Switch o the unit or re-energize the unit
after cutting o power to eliminate this malfunction.
7 E9
Full water
protection
Water level
switch
If cut-o of water level switch is detected for 8 seconds
successively once energized, the system will enter full water
protection. In this case, switch o the unit and then switch
it on to eliminate this malfunction.
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