Inverter Compressor Abnormality - Daikin RMXS-L Series Service Manual

SiUS181631EA

7.19 Inverter Compressor Abnormality

L5
Error Code
Method of Error The error is detected from current flowing in the power transistor.
Detection
Error Decision When an excessive current flows in the power transistor
(Instantaneous overcurrent also causes activation.)
Conditions
Supposed
Causes
Troubleshooting
Disconnect the connection
between the compressor
and the main PCB. Turn the
power transistor check
mode setting ON in setting
mode 2.
Note: Higher voltage than actual is displayed when the inverter output voltage is checked by multimeter.
Troubleshooting
Defective compressor coil (disconnected, defective insulation)
Compressor start-up malfunction (mechanical lock)
Defective main PCB (A1P)
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Is the
compressor's coil
YES
disconnected or the
insulation is
defective?
NO
Is the inverter
output voltage
balanced? (Normal if
NO
within ±5V. Must be
measured when
frequency is
stable.)
YES
There is
NO
instantaneous power
failure.
YES
Troubleshooting for Outdoor Unit
Replace the compressor.
Replace the main PCB
(A1P).
Inspect the compressor
according to the diagnosis
procedure for odd noises,
vibration and operating
status of the compressor.
Correct power supply.
(R22101)
247