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