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50
Error Codes Display for Indoor Unit
Protection and Error Codes
Code
Descriptions
C1
AC Voltage higher than 254V, unit stops to work, error code stays on until AC voltage drops below 254V
C2
AC Voltage lower than 197V, unit stops to work, error code stays on until AC voltage rises above 197V
C4
DC Voltage higher than 350V, unit stops to work, error code stays on until DC voltage drops below 350V
C5
DC Voltage lower than 150V, unit keeps on working, code stays on until DC voltage rises above 150V
C7
Compressor over current/over load protection
C8
Incorrect wiring between indoor unit and outdoor unit, unit stops to work until correction is made
P1
Refrigerant pressure too HIGH, unit stops to work until error is cleared
P2
Refrigerant pressure too LOW, unit stops to work until error is cleared
P6
4-way switching valve abnormal
A1
Error of temperature sensor for indoor air temperatures-open, short or other issues
A2
Error of temperature sensor for indoor coil tube temperatures-open, short or other issues
A3
Error of temperature sensor for outdoor air temperatures-open, short or other issues
A4
Error of temperature sensor for outdoor coil tube temperatures-open, short or other issues
A5
Error of temperature sensor for outdoor compressor discharge temperatures-open, short or other issues
A6
High temperature at compressor discharge tube, unit stops to work until error is cleared
A7
High temperature at outdoor coil, unit stops to work until error is cleared
AC
Anti-freeze/anti-low temperature at indoor coil tube, unit keeps on working
F3
No feedback at indoor fan motor
F6
No feedback at outdoor fan motor
H1
Compressor over load/over current protection
H7
Compressor input power phase error
H8
Driving board check compressor over current
b3
Radiator or IPM, PFC module-Temperature sensor abnormal
b4
Radiator or IPM, PFC module-Temperature too high
b5
Compressor-loses steps, not detecting rotator position
b6
PFC abnormal or protection
b7
IPM abnormal or protection
b9
Starting failure
bb
Communication error between driving board-main board
J3
Storage chip error at driving board
J7
Suction temperature sensor-open, short or other issues
J9
Outdoor coil middle temperature sensor-open, short or other issues
Note:
The above error code information is applicable to several models of air conditioners, but because of product changes
or improvements, they can change. Please refer to the User’s Manual for more information, or have a technician
contact YMGI.