Inverter Current Abnormality - Daikin RMXS-L Series Service Manual

Troubleshooting for Outdoor Unit

7.20 Inverter Current Abnormality

L8
Error Code
Method of Error The error is detected by current flowing in the power transistor.
Detection
Error Decision When overload in the compressor is detected. (Inverter secondary current 16.1 A)
(1) 19.0 A and over continues for 5 seconds.
Conditions
(2) 16.1 A and over continues for 260 seconds.
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.
248
Compressor overload
Compressor coil disconnected
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
secondary
YES
current of the inverter
higher than 16.1 A, 260
sec. for each
phase?
NO
Is the
YES
compressor's coil
disconnected.
NO
Is the
inverter
output voltage
balanced? (Normal if
NO
within ±5 V. Must be
measured when
frequency is
stable.)
YES
After
NO
L8
turning on again,
blinks again.
YES
SiUS181631EA
Compressor overload.
Inspect the compressor
and refrigerant system.
Replace the compressor.
Replace the main PCB
(A1P).
Reset and restart.
Inspect the compressor
according to the diagnosis
procedure for odd noises,
vibration and operating
status of the compressor.
(R22102)
Troubleshooting