Daikin 10 - Page 105

102
7
Troubleshooting
5
Troubleshooting
Diagnosis Countermeasures
1
Applicable Models
AKZ**A (All series)
2
Methods of Malfunction Detection
Detect according to the output
revolutions of the compressor
(M2C).
3
Malfunction Decision Conditions
Class Conditions
70
When compressor step-
out is detected.
(Retry: 3 times)
71
When low voltage
abnormality is detected.
(Retry: 3 times)
4
Supposed Causes
1Compressor (M2C)
overloaded
1Compressor (M2C)
mechanically locked
1Faulty inverter board (A2P)
1Faulty power supply voltage
(e.g. instantaneous power
failure or slow-down of
voltage)
1Noises present in the power
supply line
1Lightning surge
Control panel display
L8
Compressor Overloaded
NO
YES
NO
The
power supply
voltage shows fluctuations such
as instantaneous power
failure.
NO
YES
The power
supply line contains
noises.
YES
Rectify the power
supply voltage.
Remove noises from the
power supply line.
Is each resistance
of the compressor normal?
"Check 3"
(See page 117)
Replace the unit.
Replace the
compressor (M2C).
(See page 132/148)
NO
Check the alarm code in service monitor mode.
L8.70 L8.71
YES
Replace the inverter
board (A2P).
(See page 126/141)
Is the continuity
normal?
Check the power device for continuity.
00_PB00540A_M10.indb 102 2023/08/09 12:59:07