
– 40 –
Split Inverter Air-to-Water Heat Pump
Maintenance/Troubleshooting
Faults Query
Display Corresponding
Status Display Fault
Cause
Troubleshooting
Corrective Action
E27
-
IPM Overcurrent
protectuon
Electronic control fault
Contact Technical Support
Adjust or replace faulty control
component
E28
-
IPM Overtemp
protectuon
Electronic control fault
Contact Technical Support
Adjust or replace faulty control
component
E29
-
Radiator Temp
Sensor Fault
N/A
Reserved, does not apply to this
unit
Reserved, does not apply to this
unit
E30
-
Power Component
Overheat protection
Excessive heat inside
cabinet
Check indoor and outdoor moduled
for extreme temperature.
Ensure sufficient cooling airflow
through cabinet. Replace faulty
component.
E31
E32
-
IPM Abnormal
Current
Electronic control fault
Contact Technical Support
Replace faulty control component
E33
-
Compressor
Overcurrent
Shutdown
Excess current draw by
compressor
Measure compressor current at full
load. Should not exceed 36A
Inspect compresor and wiring.
E34
-
Compressor
Overcurrent Alarm
Excess current draw by
compressor
Measure compressor current at full
load. Should not exceed 36A
Inspect compresor and wiring.
E35
-
Input voltage phase
loss
Weak leg of 3 phase to
compressor
Check 3 phase power between
Inverter board and the compressor
Replace compressor or inverter
board
E36
-
Compressor failed
to start
Electronic control fault
Contact Technical Support
Replace faulty control component
E37
-
DSP and COMM
board fault
Communication fault
Check communication wires, cycle
power
Repair or replace control wire
connections
E38
-
DSP and PFC board
fault
Communication fault
Check communication wires, cycle
power
Repair or replace control wire
connections
E39
-
Abnormal voltage
sampling
Electronic control fault
Contact Technical Support
Replace inverter driver board
E40
-
EEPPROM fault
Electronic control fault
Contact Technical Support
Replace EEPROM Chip
E41
-
Compressor flux
weakening
Electronic fault condition Cycle input power
Restart after power down
E42
-
Driver board 15V
voltage fault
Board voltage too low
or high
Contact Technical Support
Replace faulty control component
E45
-
PFC fault
Inverter driver board
fault
Contact Technical Support
Replace inverter driver board
E46
-
Fan 1 fault
Fain fails to start due to
mechanical damage
Check for damage or interference
Clear interference or replace
damaged component
E47
-
Fan 2 fault
Fain fails to start due to
mechanical damage
Check for damage or interference
Clear interference or replace
damaged component
EE8
-
Communication fault
between drive board
and main board
Communication fault
Check RS485 wiring between driver
board and main board (in Outdoor
module)
Repair or correct RS485 wiring or
polarity
E08
-
Communication
fault between
touchscreen display
and main board
Communication fault
Check RS485 wiring between
touchscreen display and main
board (in Intdoor module)
Repair or correct RS485 wiring or
polarity
E09
-
Communication fault
between Indoor and
Outdoor module
Communication fault
Check RS485 wiring (suplied with
refrigerant linset) between indoor
and outdoor modules.
Repair or correct RS485 wiring or
polarity