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40MBAB: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
13
TROUBLESHOOTING
Test the voltage between P and N on back of the outdoor unit main PCB with a multimeter. If the voltage is lower than 36V, the capacitors are fully
discharged.
Error Display (Indoor Unit)
When the indoor unit encounters a recognized error, an error code appears (see Table 6).
Table 6 — Error Display (Indoor Unit)
For other errors:
The display board may display a code or a code undefined by the service manual. Ensure the code is not a temperature reading.
Table 7 — Error Display on Two Way Communication Wired Controller
The other error codes displayed on the wire controller are the same from those on the unit.
DISPLAY
ERROR INFORMATION
SOLUTION
EH00
Indoor unit EEPROM parameter error
Page 16
EL01
Indoor / outdoor unit communication error
Page 17
EL16
Communication malfunction between adapter board and outdoor main board
Page 32
EH03
The indoor fan speed is operating outside of the normal range (for some models)
Page 22
EH60
Indoor room temperature sensor T1 is in open circuit or has short circuited
Page 22
EH61
Evaporator coil temperature sensor T2 is in open circuit or has short circuited
Page 22
EH62
Evaporator coil temperature sensor T2B is in open circuit or has short circuited
Page 22
EH65
Evaporator coil temperature sensor T2A is in open circuit or has short circuited
Page 22
ELOC
Refrigerant Leakage Detection (for some models)
Page 23
EH06
Communication error between indoor two chips
--
EH0E
Water-level alarm malfunction
Page 24
EC07
The outdoor fan speed is operating outside of the normal range (for some models)
Page 20
EC51
Outdoor unit EEPROM parameter error
--
EC52
Condenser coil temperature sensor T3 is in open circuit or has short circuited
Page 22
EC53
Outdoor room temperature sensor T4 is in open circuit or has short circuited
Page 22
EC54
Compressor discharge temperature sensor TP is in open circuit or has short circuited
Page 22
EC56
Evaporator coil outlet temperature sensor T2B is in open circuit or has short circuited (for free match indoor units)
--
PC00
IPM malfunction or IGBT over-strong current protection
Page 25
PC01
Over voltage or over low voltage protection
Page 26
PC02
Top temperature protection of compressor or High temperature protection of IPM module
Page 27
PC03
Low pressure protection (for some models)
Page 28
PC04
Inverter compressor drive error
Page 29
EC0d
Outdoor unit malfunction
Page 30
PC0L
Low ambient temperature protection
Page 30
FL09
Mismatch between the new and old platforms
Page 32
DISPLAY
MALFUNCTION OR PROTECTION
SOLUTION
EH63
Communication error between wire controller and indoor unit
---
Turn off all power supplies or disconnect all wires to avoid electric
shock. While checking indoor/outdoor PCB, please equip oneself with
anti-static gloves or wrist strap to avoid damage to the board.
WARNING
Electricity remains in capacitors even when the power supply is off.
Ensure the capacitors are fully discharged before troubleshooting.
WARNING