Outdoor Unit Diagnostic Guides - Carrier 38MA R Series Installation Instructions Manual

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.
DISPLAY
Communication malfunction between indoor and outdoor units.
E1
Protection of over current
F0
F1 Open circuit or short circuit of outdoor ambient temperature sensor T4
Open circuit or short circuit of condenser coil temperature sensor T3
F2
Open circuit or short circuit of Compressor discharge temperature sensor T5
F3
F4 Outdoor unit EEPROM error
F5 The outdoor fan speed is running outside of its normal operating range
IPM malfunction
P0
Over voltage or over low voltage protection
P1
P2 High temperature protection of compressor top
Outdoor low temperature protection
P3
Inverter compressor drive error
P4
P7 Outdoor IGBT temperature sensor error
High temperature protection of indoor coil in heating
J0
Outdoor temperature protection of outdoor coil in cooling
J1
J2 Discharge temperature protection
Protection of active PFC module
J3
Communication error between control board and IPM board
J4
J5 High - pressure switch protection
Low - pressure switch protection
J6
AC voltage protection
J8
For additional diagnostic information, refer to the service manual.
38MAR-04SI
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
LED STATUS
Specifications subject to change without notice.
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