Zodiac PX50 MD12 Instructions For Installation And Use Manual page 26

EE24
Ambient temperature or printed circuit
board
EE25
Compressor power error
EE26
4-way valve inversion error
EE27
EEPROM memory data error
EE28
Communication error with the controller
24
Ambient temperature or input water
temperature too low.
The compressor operates with 1 or 2
phases.
Blockage-inversion of the 4-way valve.
Low refrigerant (no d5-TH2 or d3-TH1
detection).
Data loss in the memory.
Printed circuit board error.
Printed circuit board error.
Check and replace the printed
circuit board.
Check the wiring.
Switch to heating/cooling mode to
check inversion of the valve.
Replace the 4-way valve.
Check refrigerant levels.
Reload the data to the memory.
Replace the printed circuit board.
Off/on to restart.
Check and replace the printed
circuit board.