38MHRC: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
27
Outdoor Unit Diagnostic Guide
Table 11 — Outdoor Unit Diagnostic Guide
O (light) X (off) (flash)
Operation Lamp Timer Lamp Display LED Status
1 time
OFF E0 Indoor unit EEPROM parameter error
2 times
OFF E1 Indoor / outdoor unit communication error
3 times
OFF E2 Zero-crossing signal detection error (for some models)
4 times
OFF E3 The indoor fan speed is operating outside of the normal range
5 times
OFF E4 Indoor room temperature sensor T1 is in open circuit or has short circuited
6 times
OFF E5 Evaporator coil temperature sensor T2 is in open circuit or has short circuited
9 times
OFF E7/EH 0b Indoor PCB / Display board communication error (for some models)
7 times
OFF EC Refrigerant leak detected
1 time
ON F0 Current overload protection
2 times
ON F1 Outdoor room temperature sensor T4 is in open circuit or has short circuited
3 times
ON F2 Condenser coil temperature sensor T3 is in open circuit or has short circuited
4 times
ON F3 Compressor discharge temperature sensor TP is in open circuit or has short circuited
7 times
ON F6
Evaporator coil outlet temperature sensor T2B is in open circuit or has short circuited (for free-match
indoor units)
5 times
ON F4 Outdoor unit EEPROM parameter error
6 times
ON F5 The outdoor fan speed is operating outside of the normal range (for some models)
1 time
FLASH P0 IPM malfunction or IGBT over-strong current protection
2 times
FLASH P1 Over voltage or over low voltage protection
3 times
FLASH P2 High temperature protection of IPM module or High pressure protection
5 times
FLASH P4 Inverter compressor drive error
7 times
FLASH P6 Low pressure protection some models)
6 times
FLASH P5/-- Indoor units mode conflict (match with multi outdoor unit)
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