Compressor Start-Up Error - Daikin RMXS-L Series Service Manual

SiUS181631EA

7.21 Compressor Start-up Error

L9
Error Code
Method of Error The error is detected from current flowing in the power transistor.
Detection
Error Decision Starting control of the compressor does not complete.
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.
Troubleshooting
Defective compressor
Large pressure difference before starting the compressor
Defective main PCB (A1P)
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
The
difference
between high and
NO
low pressure when starting
is above 0.2 MPa
(67 ftAq).
YES
Is the
inverter
output voltage
balanced? (Normal if
NO
within ±5 V. Must be
measured when
frequency is
stable.)
YES
After
NO
L9
turning on again,
blinks again.
YES
Troubleshooting for Outdoor Unit
Unsatisfactory pressure
equalization.
Check refrigerant system.
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.
(R22103)
249