Carrier 38QUS012D8S - Page 111

Troubleshooting
Electrical Control System 109
2.2 Indoor Unit Malfunctions
Malfunction
Error Code
Timer Lamp
Operation Lamp
(flashes)
Indoor EEPROM malfunction
E0
X
1
Communication malfunction between indoor and outdoor units
E1
X
2
Indoor fan speed malfunction
E3
X
4
T1 temperature sensor open or short circuit
E4
X
5
T2 temperature sensor open or short circuit
E5
X
6
Refrigerant leakage detection
EC
X
7
Water level alarm malfunction
EE
X
8
Communication error between master and slave unit (for twins system)
E8
X
9
Another indoor unit malfunction (for twins system)
E9
X
10
Outdoor unit is faulty (for old communication protocol)
Ed
X
11
Overcurrent protection (for some units)
F0
O
1
T4 temperature sensor open or short circuit
F1
O
2
T3 temperature sensor open or short circuit
F2
O
3
T5 temperature sensor open or short circuit
F3
O
4
Outdoor EEPROM malfunction (for some units)
F4
O
5
Outdoor fan speed malfunction
F5
O
6
T2B temperature open or short circuit (for free-match indoor units)
F6
O
7
Communication error between auto-lifting panel and slim cassette
F7
O
8
Auto-lifting panel is faulty (for slim cassettes with an auto-lifting panel)
F8
O
9
Auto-lifting panel is not closed (for slim cassettes with an auto-lifting
panel)
F9
O
10
IPM module malfunction
P0
☆
1
DC voltage too high/too low protection
P1
☆
2
Top of compressor high temperature protection
P2
☆
3
Low ambient temperature protection
P3
☆
4
Inverter compressor drive protection
P4
☆
5
Compressor low pressure protection
P6
☆
7
Outdoor IGBT sensor is faulty
P7
☆
8
O (on) X(off) ☆(flash at 2Hz)