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EE22
High voltage protection
The power supply is incorrect.
Replace the printed circuit board.
The power board is faulty.
Replace the printed circuit board.
EE23
Compressor start-up error
The power board is faulty.
Check the printed circuit board.
Accumulation of liquid and gas.
Check the power supply voltages
The voltage is unstable.
Check the voltage.
EE24
Ambient temperature or printed circuit
board
Ambient temperature or input water
temperature too low.
Check and replace the printed
circuit board.
EE25
Compressor power error
The compressor operates with 1 or 2
phases.
Check the wiring.
EE26
4-way valve inversion error
Blockage-inversion of the 4-way valve.
Switch to heating/cooling mode to
check inversion of the valve.
Replace the 4-way valve.
Low refrigerant (no d5-TH2 or d3-TH1
detection).
Check refrigerant levels.
EE27
EEPROM memory data error
Data loss in the memory.
Reload the data to the memory.
Printed circuit board error.
Replace the printed circuit board.
EE28
Communication error with the controller
Printed circuit board error.
Off/on to restart.
Check and replace the
printed
circuit board.