Troubleshooting - Carrier Performance 40MBDQ Series 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. The
indoor diagnostic display is a combination of flashing LEDs on the display panel or the front of the unit. If possible, always check
the diagnostic codes displayed on the indoor unit first before consulting a service technician.
The diagnostic codes, displayed in the indoor and outdoor units, are listed in Table 15
INDOOR UNIT DIAGNOSTIC GUIDES
OPERATION
TIMER LAMP
LAMP
 X
1 time
 X
2 times
 X
8 times
X

4 times
X

5 times
 X
6 times
X

9 times
X

10 times
X

7 times
O

1 time
O

11 times
 O
2 times
O

3 times
O

4 times
 O
5 times
 O
6 times
 O
7 times
 «
1 time
 «
2 times
 «
3 times
 «
4 times
 «
5 times
 «
7 times
 «
8 times
For additional diagnostic information, refer to the indoor unit service manual.
IM-40MBDQ-05
Table 15 — Indoor Unit Diagnostic Guides
DISPLAY
E0 Indoor unit EEPROM parameter error
E1 Indoor / outdoor units communication error
EE Water level alarm malfunction
E3 Indoor fan speed is out of control
E4 Indoor room temperature sensor T1 open circuit or short circuit
E5 Evaporator coil temperature sensor T2 open circuit or short circuit
E8 Dual indoor unit (twin model only) communication malfunction
E9 Other twin model malfunction
EC Refrigerant leakage detection
F0 Overload Protection
Fa Indoor unit communication malfunction
F1 Outdoor ambient temperature sensor T4 open circuit or short circuit
F2 Condenser coil temperature sensor T3 open circuit or short circuit
F3 Compressor discharge temperature sensor T5 open circuit or short circuit
F4 Outdoor unit EEPROM parameter error
F5 Outdoor fan speed is out of control
F6 Compressor low-pressure protection
P0 IPM malfunction or IGBT over-strong current protection
P1 Over voltage or over low voltage protection
P2 High temperature protection of compressor top diagnosis and solution (9K,12K models only)
P3 Outdoor low temperature protection
P4 Inverter compressor drive error
P6 Compressor low-pressure protection
P7 Outdoor IGBT sensor error
O (light) X (off) «(flash)
Specifications subject to change without notice.
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LED STATUS
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