Daikin 10 - Page 104

●Troubleshooting
101
7
Troubleshooting
Troubleshooting
5
Troubleshooting
Diagnosis Countermeasures
1
Applicable Models
AKZ**A (All series)
2
Methods of Malfunction Detection
Detect according to current
passing through the power
device.
Detected with error signal at
the time of IPM temperature
abnormality. (AKZ14A–56A
only)
3
Malfunction Decision Conditions
Class Conditions
70
When compressor step-
out is detected (within 3
minutes after startup).
(Retry: 3 times)
71
When compressor step-
out is detected (after 3
minutes after startup).
(Retry: 3 times)
72
When an IPM error
signal is detected.
(Retry: 3 times)
4
Supposed Causes
1Faulty compressor coil
(M2C)
1Overcurrent due to the stall
of compressor (M2C)
1Faulty power device
1Noise to power supply line
1Faulty inverter board (A2P)
1Blocked air inlet and outlet
(AKZ14A–56A only)
1Dirty radiator fin
(AKZ14A–56A only)
1Ambient temperature too
high
(AKZ14A–56A only)
Control panel display
L5
Instantaneous Overcurrent of Power Device or IPM
Temperature Abnormality (AKZ14A–56A only)
NO
YES
The
power supply voltage
shows fluctuations such as
instantaneous power
failure.
Rectify the power
supply voltage.
NO
YES
The power
supply line contains
noises.
Remove noises from the
power supply line.
Replace the unit.
Replace the
compressor (M2C).
(See page 132/148)
NO
YES
Replace the inverter
board (A2P).
(See page 126/141)
NO
Is the continuity
normal?
Check the power device for continuity.
YES
Is each resistance
of the compressor normal?
"Check 3"
(See page 117)
NO
YES
Is the
temperature around
the radiator fin
high?
Remove causes of rise
in the temperature.
• Blocked air inlet and
outlet of the unit.
• Dirty radiator fin
• Ambient temperature
too high
Check the model name.
Check the alarm code in service
monitor mode.
In all other
cases
L5.72 and
AKZ14A–56A
(200 V models)
00_PB00540A_M10.indb 101 2023/08/09 12:59:07