Troubleshooting - Carrier 40MBD-06SI Installation Instructions Manual

TROUBLESHOOTING

For ease of service, the systems are equipped with diagnostic code
display LEDs on both the indoor and outdoor units. The outdoor
diagnostic display consists of two LEDs (Red and Green) on the
outdoor unit board and is limited to a few errors.
INDOOR UNIT DIAGNOSTIC GUIDES
OPERATION
TIMER LAMP
LAMP
H
1 time
H
2 times
H
3 times
H
4 times
H
5 times
H
6 times
H
7 times
H
2 times
H
3 times
H
4 times
H
5 times
H
6 times
H
1 time
H
2 times
H
3 times
H
5 times
For additional diagnostic information, refer to the Service Manual.
Table 11—Indoor Unit Diagnostic Guides
DISPLAY
X E0 Indoor unit EEPROM parameter error
X E1 Indoor / outdoor units communication error
X E2 Zero-crossing signal detection error
X E3 Indoor fan speed has been out of control
X E4 Indoor room temperature sensor T1 open circuit or short circuit
X E5 Evaporator coil temperature sensor T2 open circuit or short circuit
X EC Refrigerant leakage detection
O F1 Outdoor ambient temperature sensor T4 open circuit or short circuit
O F2 Condenser coil temperature sensor T3 open circuit or short circuit
O F3 Compressor discharge temperature sensor T5 open circuit or short circuit
O F4 Outdoor unit EEPROM parameter error
O F5 Outdoor fan speed has been out of control
H
P0 IPM malfunction or IGBT over-strong current protection
H
P1 Over voltage or over low voltage protection
High temperature protection of compressor top diagnosis and solution (only for
H
P2
9k,12k models)
H
P4 Inverter compressor drive error
O(light)
The indoor diagnostic display is a combination of flashing LEDs
on the display panel (IR Receiver). If possible, always check the
diagnostic codes displayed on the indoor unit first.
The diagnostic codes displayed in the indoor and outdoor units are
listed in Table 11.
LED STATUS
H
X(off) (flash)
21