Troubleshooting - Carrier 40MBDQ09 3 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.
INDOOR UNIT DIAGNOSTIC GUIDES
OPERATION TIMER
LAMP LAMP
H 1 time
X
H 2 times
X
H 8 times
X
H 9 times
X
H 10 times
X
H 1 time
O
H 7 times
O
H 4 times
X
H 5 times
X
H 6 times
X
H 7 times
X
H 11 times
O
H 2 times
O
H 3 times
O
H 4 times
O
H 5 times
O
H 6 times
O
H 1 time H
H 2 times H
H 3 times H
H 4 times H
H 5 times H
H 7 times H
H 8 times H
For additional diagnostic information, refer to the Service Manual.
Table 11 – Indoor Unit Diagnostic Guides
DISPLAY
E0
Indoor unit EEPROM parameter error
E1
Indoor / outdoor units communication error
EE
Water level alarm malfunction
E8
Dual indoor unit (twin model only) communication malfunction
E9
Other twin model malfunction
F0
Overload Protection
F6
Compressor low-pressure protection
E3
Indoor fan speed has been 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
EC
Refrigerant leakage detection
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 has been out of control
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)
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.
The diagnostic codes displayed in the indoor and outdoor units are
listed in Table 11.
LED STATUS
H
(flash)
25