Carrier AC Error Codes

Carrier AC is a popular air conditioning brand that has been providing reliable and efficient cooling solutions for households and businesses for several years. With its commitment to innovation and quality, Carrier has become a trusted name in the air conditioning industry, offering a wide range of air conditioning products to meet the needs of different customers.

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Below you can find the list of Error Codes for Carrier AC

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Alarm Codes	Description

Alarm Codes	Description
1	Evaporator entering fluid thermistor failure
2	Evaporator leaving fluid thermistor failure
3	Condenser entering fluid thermistor failure
4	Condenser leaving fluid thermistor failure
5	Condenser entering fluid thermistor failure
6	Condenser leaving fluid thermistor failure
7	Outdoor temperature sensor fault
8	CHWS (master/slave) fluid thermistor fault
9	Compressor A1, discharge gas sensor
10	Compressor A2, discharge gas sensor
11	Compressor B1, discharge gas sensor
12	Compressor B2, discharge gas sensor
13	External 0-10 V dc signal fault
14	Discharge pressure transducer failure,circuit A
15	Discharge pressure transducer failure, circuit B
16	Suction pressure transducer failure, crt A
17	Suction pressure transducer failure, crt B
18	Oil pressure transducer failure, compr A1
19	Oil pressure transducer failure, compr A2
20	Oil pressure transducer failure, compr B1
21	Oil pressure transducer failure, compr B2
22	Economizer A1 transducer failure
23	Economizer A2 transducer failure
24	Economizer B1 transducer failure
25	Economizer B2 transducer failure
26	Pressure sensor failure - coil pump down circuit A
27	Pressure sensor failure - coil pump down circuit B
28	Fault in the motor cooling valve position sensor, circuit A
29	Fault in the motor cooling valve position sensor, circuit B
30	Loss of communication with SCPM A1 board
31	Loss of communication with SCPM A2 board
32	Loss of communication with SCPM B1 board
33	Loss of communication with SCPM B2 board
34	Loss of communication with EXV board
35	Loss of communication with fan board #1
36	Loss of communication with fan board # 2
37	Loss of communication with auxiliary board type 1
38	Loss of communication with heat reclaim or evaporator heater board
39	'CCN/clock board' fault
40	Control box thermostat fault or phase reversal
41	Unit emergency stop
42	Initial factory configuration required
43-n	Illegal initial factory configuration
43-1	Compr A capacity too high
43-2	Compr B2 configured and compressor B1 absent
43-3	Fan configured for a water-cooled condenser
43-4	Fans not configured
43-5	Heat reclaim option configured and reclaim sensors configured
44	Discharge pressure circuit A too high
45	Discharge pressure circuit B too high
46	Oil solenoid failure, compressor A1
47	Oil solenoid failure, compressor A2
48	Oil solenoid failure, compressor B1
49	Oil solenoid failure, compressor B2
50	Pre-start oil pressure, compressor A1
51	Pre-start oil pressure, compressor A2
52	Pre-start oil pressure, compressor B1
53	Pre-start oil pressure, compressor B2
54	Oil level circuit A low
55	Oil level circuit B low
56	Low saturated suction temp, crt A
57	Low saturated suction temp, circuit B
58	High saturated suction temp, circuit A
59	High saturated suction temp, crt B
60	Low discharge superheat, circuit A
61	Low discharge superheat, crt B
62	Max. oil pressure difference, compressor A1
63	Max. oil pressure difference, compressor A2
64	Max. oil pressure difference, compressor B1
65	Max. oil pressure difference, compressor B2
66	Loss of commuincation with System Manager
67	Loss of communication with master or slave unit
68	Low oil pressure compr A1
69	Low oil pressure compr A2
70	Low oil pressure compr B1
71	Low oil pressure compr B2
72	Evaporator frost protection
73	Condenser frost protection, circuit A
74	Condenser frost protection, circuit B
75	Evaporator water flow control failure
76	Condenser water flow loss
77	High current, compressor A1
78	High current, compressor A2
79	High current, compressor B1
80	High current, compressor B2
81	Pump 1 fault
82	Pump 2 fault
83	Heat reclaim mode fault, circuit A
84	Heat reclaim mode fault, circuit B
85	Water flow fault, heat reclaim condenser
86-nn	Master/slave configuration fault
87-n	Maintenance alert
87-1	Charge too low
87-2	Water loop too low
87-3	Air filter maintenance delay elapsed
87-4	Pump 1 maintenance delay elapsed
87-5	Pump 2 maintenance delay elapsed
87-6	Water filter maintenance delay elapsed

Error Codes	Meaning
E0	Indoor unit EEPROM parameter error
E1	Indoor / outdoor units communication error
E3	Indoor fan speed has been out of control
E4	Indoor room temperature sensor T1 open circuit or shortcircuit
E5	Evaporator coil temperature sensor T2 open circuit or short circuit
EC	Refrigerant Leakage Detection
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
P4	Inverter compressor drive error
P5	Mode conflict
P6	Compressor voltage protection

Error Codes	Meaning
E0	Outdoor EEPROM malfunction
E2	Indoor/outdoor units communication error
E3	Communication malfunction between IPM board and outdoor main board
E4	Open or short circuit of outdoor unit temperature sensor
E5	Voltage protection
E8	Outdoor fan speed malfunction
F1	No A Indoor unit coil outlet temperature sensor or connector of sensor is defective
F2	No B Indoor unit coil outlet temperature sensor or connector of sensor is defective
F3	No C Indoor unit coil outlet temperature sensor or connector of sensor is defective
F4	No D Indoor unit coil outlet temperature sensor or connector of sensor is defective
F5	No E Indoor unit coil outlet temperature sensor or connector of sensor is defective
P1	High pressure protection
P2	Low pressure protection
P3	Current protection of compressor
P4	Temperature protection of compressor
P5	High temperature protection of condenser
P6	IPM module protection

Error Codes	Description
3	Room air sensor fault
2	Condensate discharge pump
4	Indoor unit coil sensor fault
6	Filter dirty
7	Outdoor unit failure
10	EEPROM corrupt
11	Card serial number damaged
12	Address / zone incomplete
13	Gas flow distributor corrupt
14	Outdoor air thermistor