Carrier 38QUS012D8S Service Manual page 111

2.2 Indoor Unit Malfunctions
Indoor EEPROM malfunction
Communication malfunction between indoor and outdoor units
Indoor fan speed malfunction
T1 temperature sensor open or short circuit
T2 temperature sensor open or short circuit
Refrigerant leakage detection
Water level alarm malfunction
Communication error between master and slave unit (for twins system)
Another indoor unit malfunction (for twins system)
Outdoor unit is faulty (for old communication protocol)
Overcurrent protection (for some units)
T4 temperature sensor open or short circuit
T3 temperature sensor open or short circuit
T5 temperature sensor open or short circuit
Outdoor EEPROM malfunction (for some units)
Outdoor fan speed malfunction
T2B temperature open or short circuit (for free-match indoor units)
Communication error between auto-lifting panel and slim cassette
Auto-lifting panel is faulty (for slim cassettes with an auto-lifting panel)
Auto-lifting panel is not closed (for slim cassettes with an auto-lifting
panel)
IPM module malfunction
DC voltage too high/too low protection
Top of compressor high temperature protection
Low ambient temperature protection
Inverter compressor drive protection
Compressor low pressure protection
Outdoor IGBT sensor is faulty
Electrical Control System
Malfunction
O (on)
Error Code
E0
E1
E3
E4
E5
EC
EE
E8
E9
Ed
F0
F1
F2
F3
F4
F5
F6
F7
F8
F9
P0
P1
P2
P3
P4
P6
P7
X(off) ☆(flash at 2Hz)
Troubleshooting
Operation Lamp
Timer Lamp
(flashes)
X 1
X 2
X 4
X 5
X 6
X 7
X 8
X 9
X 10
X 11
O 1
O 2
O 3
O 4
O 5
O 6
O 7
O 8
O 9
O 10
☆ 1
2
☆
☆ 3
4
☆
5
☆
7
☆
8
☆
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