Carrier 38QUS014DS2 series, Service Manual

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18 Troubleshooting
18.1 Indoor unit error code explanation:
For Console
Malfunction Timer Lamp
Operation Lamp
(flashes)
Indoor EEPROM malfunction X 1
Communication malfunction between indoor and outdoor units X 2
Indoor fan speed has been out of control X 4
Open or short circuit of T1 temperature sensor X 5
Open or short circuit of T2 temperature sensor X 6
Overcurrent protection (For some units) O 1
Open or short circuit of T4 temperature sensor O 2
Open or short circuit of T3 temperature sensor O 3
Open or short circuit of T5 temperature sensor O 4
Outdoor EEPROM malfunction (For some units) O 5
Outdoor fan speed is out of control O 6
Open or short circuit of T2B temperature sensor (For free-match indoor units) O 7
IPM module malfunction
☆
1
Over voltage or over low voltage protection
☆
2
Too low ambient temperature protection
☆
4
Inverter compressor drive protection
☆
5
Mode conflict
☆
6
Low pressure protection of compressor
☆
7
O (on) X(off)
☆
(flash at 2Hz)
For other type
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 has been out of control E3 X 4
Open or short circuit of T1 temperature sensor E4 X 5
Open or short circuit of T2 temperature sensor E5 X 6
Water level alarm EE X 8
Overcurrent protection (For some units) F0 O 1
Open or short circuit of T4 temperature sensor F1 O 2
Open or short circuit of T3 temperature sensor F2 O 3
Open or short circuit of T5 temperature sensor F3 O 4
Outdoor EEPROM malfunction (For some units) F4 O 5
Outdoor fan speed is out of control F5 O 6
Open or short circuit of T2B temperature sensor (For free-match indoor
units)
F6 O 7
Communication error between auto-lifting panel and slim cassette (For
F7 O 8