Daikin 4MXL-T Series Service Manual page 215

SiUS121827E
Troubleshooting
Reference
Check No.12 Refer to P.236
Reference
Check No.15 Refer to P.238
Part 6 Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
(Precaution before turning on the power again)
Make sure the power has been off for at least 30 seconds.
Stop valve
closed?
NO
Turn off the power. Disconnect the
harnesses U, V, and W.
Check No.15
Check with the inverter analyzer.
Any LED off?
YES
Turn off the power and reconnect
the harnesses. Turn on the power
again and restart the system.
Emergency stop
without compressor running?
NO
System shut
down after errors repeated
several times?
YES
YES
∗ Inverter analyzer:
RSUK0917C
NO
YES
NO
Troubleshooting for Outdoor Unit
Open the stop valve.
Correct the power supply or
replace the outdoor unit
PCB (main PCB).
Replace the compressor.
Check the electronic
expansion valve coil.
Go to Check No. 12.
Replace the compressor.
(R21067)
209