38MAR-04SI Specifications subject to change without notice. 17
OUTDOOR UNIT DIAGNOSTIC GUIDES
For ease of service, the systems are equipped with diagnostic code
display LEDs on both the indoor and outdoor units. The outdoor
diagnostic is displayed on the outdoor unit microprocessor board.
There may be a few error codes displayed in the indoor unit that might
relate to the outdoor unit's problems. If possible, always check the
diagnostic codes displayed on the indoor unit first. The diagnostic
codes displayed on the outdoor units are listed on Table 11 on
page 16.
Table 12 — Unit Diagnostic Guides
For additional diagnostic information, refer to the service manual.
DISPLAY LED STATUS
E1 Communication malfunction between indoor and outdoor units.
F0 Protection of over current
F1 Open circuit or short circuit of outdoor ambient temperature sensor T4
F2 Open circuit or short circuit of condenser coil temperature sensor T3
F3 Open circuit or short circuit of Compressor discharge temperature sensor T5
F4 Outdoor unit EEPROM error
F5 The outdoor fan speed is running outside of its normal operating range
P0 IPM malfunction
P1 Over voltage or over low voltage protection
P2 High temperature protection of compressor top
P3 Outdoor low temperature protection
P4 Inverter compressor drive error
P7 Outdoor IGBT temperature sensor error
J0 High temperature protection of indoor coil in heating
J1 Outdoor temperature protection of outdoor coil in cooling
J2 Discharge temperature protection
J3 Protection of active PFC module
J4 Communication error between control board and IPM board
J5 High - pressure switch protection
J6 Low - pressure switch protection
J8 AC voltage protection
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