Verified shared codeset

Every result below passed dual extraction agreement and source-anchor checks.

DISPLAY codeset

All-In-One Pro controller display

50 documented fault codes, shared only by the compatible models listed here.

In the display order below, the held evidence set runs from Emerald Energy EE-HWS-A1-220 to Emerald Energy EE-HWS-A1-320E-1; its published labels start with E05 and end with P9. The source and each model-mapping record remain visible on this page.

Compatible models

This result is published only for the models explicitly covered by the source evidence.

Emerald EnergyEE-HWS-A1-220
Emerald EnergyEE-HWS-A1-220-1
Emerald EnergyEE-HWS-A1-220E
Emerald EnergyEE-HWS-A1-220E-1
Emerald EnergyEE-HWS-A1-220E-2
Emerald EnergyEE-HWS-A1-270
Emerald EnergyEE-HWS-A1-270-1
Emerald EnergyEE-HWS-A1-270E
Emerald EnergyEE-HWS-A1-270E-1
Emerald EnergyEE-HWS-A1-270E-2
Emerald EnergyEE-HWS-A1-320
Emerald EnergyEE-HWS-A1-320-1
Emerald EnergyEE-HWS-A1-320E
Emerald EnergyEE-HWS-A1-320E-1

Published codes

Fault code

E05

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as High pressure switch failure.

A licensed technician confirms the actual cause.

View the canonical E05 result

Fault code

E09

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as Communication failure between controller and main board.

A licensed technician confirms the actual cause.

View the canonical E09 result

Fault code

E12

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as Gas exhaust temperature too high.

A licensed technician confirms the actual cause.

View the canonical E12 result

Fault code

E15

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as Water tank temperature sensor failure (bottom).

A licensed technician confirms the actual cause.

View the canonical E15 result

Fault code

E16

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as Evaporator coil temperature sensor failure.

A licensed technician confirms the actual cause.

View the canonical E16 result

Fault code

E18

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as Gas exhaust temperature sensor failure.

A licensed technician confirms the actual cause.

View the canonical E18 result

Fault code

E21

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as Ambient temperature sensor failure.

A licensed technician confirms the actual cause.

View the canonical E21 result

Fault code

E27

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as Water tank temperature sensor failure (top).

A licensed technician confirms the actual cause.

View the canonical E27 result

Fault code

E29

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as Gas suction temperature sensor failure.

A licensed technician confirms the actual cause.

View the canonical E29 result

Fault code

E38

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as Fan motor failure.

A licensed technician confirms the actual cause.

View the canonical E38 result

Fault code

E55

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as Power detection module communication failure.

A licensed technician confirms the actual cause.

View the canonical E55 result

Fault code

E88

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as Compressor driver board failure.

A licensed technician confirms the actual cause.

View the canonical E88 result

Fault code

E96

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as Communication failure between compressor driver board.

A licensed technician confirms the actual cause.

View the canonical E96 result

Fault code

E98

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as Communication failure between fan driver board and main.

A licensed technician confirms the actual cause.

View the canonical E98 result

Fault code

EC4

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as Compressor high temperature protection.

A licensed technician confirms the actual cause.

View the canonical EC4 result

Fault code

P1

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as IPM over current/IPM module protection.

A licensed technician confirms the actual cause.

View the canonical P1 result

Fault code

P10

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as AC input under voltage.

A licensed technician confirms the actual cause.

View the canonical P10 result

Fault code

P11

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as AC input over current.

A licensed technician confirms the actual cause.

View the canonical P11 result

Fault code

P12

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as AC input detection failure.

A licensed technician confirms the actual cause.

View the canonical P12 result

Fault code

P13

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as Communication failure between DSP and PFC.

A licensed technician confirms the actual cause.

View the canonical P13 result

Fault code

P14

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as Radiator temperature sensor failure.

A licensed technician confirms the actual cause.

View the canonical P14 result

Fault code

P15

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as Communication failure between DSP and.

A licensed technician confirms the actual cause.

View the canonical P15 result

Fault code

P16

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as Communication failure between main board and driver.

A licensed technician confirms the actual cause.

View the canonical P16 result

Fault code

P17

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as Compressor over current alarm.

A licensed technician confirms the actual cause.

View the canonical P17 result

Fault code

P18

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as Compressor weak magnetic alarm.

A licensed technician confirms the actual cause.

View the canonical P18 result

Fault code

P19

Red — urgent safety concern

Red means the documented fault involves safety-critical, leak, electrical, refrigerant, lockout or overheat language.

Documented as PIM overheat alarm.

A licensed technician confirms the actual cause.

View the canonical P19 result

Fault code

P2

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as Compressor fails to be driven/Software control.

A licensed technician confirms the actual cause.

View the canonical P2 result

Fault code

P20

Red — urgent safety concern

Red means the documented fault involves safety-critical, leak, electrical, refrigerant, lockout or overheat language.

Documented as PFC overheat alarm.

A licensed technician confirms the actual cause.

View the canonical P20 result

Fault code

P21

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as AC input over current alarm.

A licensed technician confirms the actual cause.

View the canonical P21 result

Fault code

P22

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as EEPROM alarm.

A licensed technician confirms the actual cause.

View the canonical P22 result

Fault code

P25

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as Temperature sensor failure to lead frequency limit.

A licensed technician confirms the actual cause.

View the canonical P25 result

Fault code

P26

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as AC under voltage alarm to lead frequency limit.

A licensed technician confirms the actual cause.

View the canonical P26 result

Fault code

P28

Red — urgent safety concern

Red means the documented fault involves safety-critical, leak, electrical, refrigerant, lockout or overheat language.

Documented as IPM overheat to lead system shutdown.

A licensed technician confirms the actual cause.

View the canonical P28 result

Fault code

P29

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as Compressor lack of phase.

A licensed technician confirms the actual cause.

View the canonical P29 result

Fault code

P3

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as Compressor over current.

A licensed technician confirms the actual cause.

View the canonical P3 result

Fault code

P30

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as Compressor overload.

A licensed technician confirms the actual cause.

View the canonical P30 result

Fault code

P31

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as Input current detection failure.

A licensed technician confirms the actual cause.

View the canonical P31 result

Fault code

P32

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as PIM supply voltage failure.

A licensed technician confirms the actual cause.

View the canonical P32 result

Fault code

P33

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as Pre-charge voltage failure.

A licensed technician confirms the actual cause.

View the canonical P33 result

Fault code

P34

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as EEPROM failure.

A licensed technician confirms the actual cause.

View the canonical P34 result

Fault code

P35

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as AC input over voltage failure.

A licensed technician confirms the actual cause.

View the canonical P35 result

Fault code

P36

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as Micro electronic parts failure.

A licensed technician confirms the actual cause.

View the canonical P36 result

Fault code

P37

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as Compressor model code failure.

A licensed technician confirms the actual cause.

View the canonical P37 result

Fault code

P38

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as Over current detection (hardware detection).

A licensed technician confirms the actual cause.

View the canonical P38 result

Fault code

P4

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as Input power supply lack of phase(not for single phase).

A licensed technician confirms the actual cause.

View the canonical P4 result

Fault code

P5

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as IPM current detection failure.

A licensed technician confirms the actual cause.

View the canonical P5 result

Fault code

P6

Red — urgent safety concern

Red means the documented fault involves safety-critical, leak, electrical, refrigerant, lockout or overheat language.

Documented as Power component overheat to lead system shutdown.

A licensed technician confirms the actual cause.

View the canonical P6 result

Fault code

P7

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as Pre-charge failure.

A licensed technician confirms the actual cause.

View the canonical P7 result

Fault code

P8

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as DC bus over voltage.

A licensed technician confirms the actual cause.

View the canonical P8 result

Fault code

P9

Amber — service attention

Amber means the fault needs attention; contact the manufacturer or a licensed technician if it persists.

Documented as DC bus under voltage.

A licensed technician confirms the actual cause.

View the canonical P9 result

Official source

Where this result comes from

Emerald Energy. Emerald Heat Pump All-In-One Pro Instructions. Retrieved 29 August 2026.

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