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Diagnosis for On-Off models
Flash times
for remote type
Failure code
on wired controller
Failure code
for central control
Failure description Reason
1
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11
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19
20
Indoor ambient temp. sensor failure
Indoor coil temp. sensor failure
Outdoor ambient temp. sensor failure
Outdoor coil temp. sensor failure/ Compressor
discharging temp. sensor abnormal
Over-current protection / Power supply
abnormal
High/Low pressure abnormal
Communication between wired controller and
indoor abnormal
Communication between indoor and outdoor
abnormal
Drainage system abnormal
Outside alarm signal input
Gas pipe temp. sensor abnormal
Temperature protection malfunction
EEPROM abnormal
Compressor overheat
Abnormal mode
Outdoor coil B(suction temp sensor-for MRV II)
Outdoor discharging B(oil temp sensor-for
MRV II)
Sensor broken down or short circuit for more than 2
min
continuously
Sensor broken down or short circuit for more than 2
min
continuously
Sensor broken down or short circuit for more than
2min continuously
Sensor broken down or short circuit for more than
2min continuously
CT check abnormal 3 times in 30
min / Fault phase,
short of phase,out of balance greatly
High pressure switch acts 3 times in 30min/Low pressure
switch acts in normal running
Communication abnormal for more than 4
min continuously
Communication abnormal for more than 4
min continuously
Float switch broken down for more than 25
min continuously
Outside signal broken down for more than 10s
Sensor broken down or short circuit for more than 2
min
continuously
Solenoid valve act incorrectly 3 times continuously
EEPROM data missing
The discharging temperature is higher than 120degree
Indoor operation mode is different with the running
indoor unit.
Sensor broken down or short circuit for more than 2
min
continuously
Sensor broken down or short circuit for more than 2
min
continuously
Remarks
01(01H)
02(02H)
74(4AH)
73(49H)
72(48H)
83(53H)
07(07H)
06(06H)
08(08H)
11(0BH)
03(03H)
13(0DH)
05(05H)
80(50H)
12(0CH)
75(4BH)
77(4DH)
01D
02D
11D
12D
10D
14D
06D
05D
21D
30D
20D
31D
17D
15D
23D
18D
15D
Resumable
if lower than
100 degree
shows resumable fault,
shows it is not resumable fault.
Troubleshooting
11