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38MGRBQ: Service Manual
Diagnostic Guides (Cont)
DISPLAY
Communication Malfunction between indoor and outdoor units
E1
Current Overload Protection
F0
Outdoor Ambient Temperature Sensor (T4) malfunction
F1
F2
Condenser coil temperature sensor (T3) malfunction
F3
Compressor discharge temperature sensor (T5) malfunction
Outdoor unit EEPROM parameter error
F4
Outdoor fan speed is out of control
F5
Inverter module (IPM) malfunction
PO
P1
Over-voltage or under voltage protection
P2
Compressor top high temperature protection (OLP)
Low ambient temperature cut off in HEATING
P3
Compressor drive malfunction
P4
J0
High temperature protection of outdoor coil in COOLING
J1
Outdoor temperature protection of indoor coil in HEATING
Temperature protection of compressor discharge
J2
PFC Module Protection
J3
Communication malfunction between control board and IPM board
J4
J5
High pressure protection
J6
Low pressure protection
Outdoor IPM module temperature sensor malfunction
P7
AC voltage protection
J8
Injection enthalpy inlet temperature sensor error
Fb
Fd
Injection enthalpy outlet temperature sensor error
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Table 24 — Outdoor Unit Error Display (48 High Heat Only)
MALFUNCTION AND PROTECTION INDICATION
27
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