Inverter Start Up Error - Daikin E-Series Service Manual

Troubleshooting for Outdoor Unit
7.21

Inverter Start up Error

L9
Remote
Controller
Display
Applicable AII outdoor unit models
Models
Method of Malfunction is detected from current flowing in the power transistor.
Malfunction
Detection
Malfunction When overload in the compressor is detected during startup
Decision
Conditions
Supposed
Causes
Troubleshooting
380
Defect of compressor
Pressure differential start
Defect of outdoor unit PCB (A1P)
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
The
difference
between high and low
pressure when starting is
above 0.2MPa.
YES
Disconnect the connection
between the compressor
and inverter. Make the
power transistor check
mode ON by service mode.
Inverter
output
voltage check
Inverter output voltage
is not balanced. (Normal if
within ±5V) Must be
measured when
frequency is
stable.
YES
After turning
on again, "L9" blinks
again.
YES
NO
NO
NO
SiAU18-715
Unsatisfactory pressure
equalization
Check refrigerant system.
Replace outdoor unit PC
board (A1P).
Reset and restart.
Compressor inspection
Inspect according to the
diagnosis procedure for
odd noises, vibration and
operating status of the
compressor.
(Q0570)
Troubleshooting