Daikin 2MXS-N Series Service Manual page 171

SiUS121502E
Troubleshooting
Check No.15
Refer to P.171
Check No.21
Refer to P.175
Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Turn off the power. Then, turn on
the power to restart the system.
Start operation.
∗ Running current
as shown at right
with relay cable 1
or 2?
NO
Check No. 21
Check the capacitor voltage.
+ 100
Within 320 VDC?
- 50
NO
Measure the rectifier input voltage.
Voltage
within the allowable
range (Power supply
voltage ± 15%)?
YES
YES
Current Capacitor charged when
(guideline) the indoor unit or outdoor
unit main relay turns on
Rising with increasing
frequency
Time
2 sec
YES
Turn off the power. Disconnect the
harnesses U, V, and W.
Check No.15
Check with the inverter analyzer.
Any LED OFF?
NO
Turn off the power and reconnect
the harnesses. Then turn on the
power again and restart operation.
Compressor running?
YES
NO
Troubleshooting for Outdoor Unit
Replace the outdoor unit
PCB (main PCB).
∗ Inverter analyzer:
RSUK0917C
YES
Correct the power supply or
replace the outdoor unit PCB
(main PCB).
NO
Replace the compressor.
Replace the outdoor unit
PCB (main PCB).
Check the power supply
voltage.
Replace the outdoor unit
PCB (main PCB).
(R22271)
159