L9" Indoor Unit: Inverter Start Up Error - Daikin ALTHERMA HT ERSQ 011 AA Service Manual

ESIE09-08A
3.46 "L9 " Indoor Unit: Inverter Start up Error
L9
Remote Control
Display
Subcode 9
Applicable Models All indoor units
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
 Defect of compressor
Supposed Causes
 Pressure differential start
 Defect of outdoor unit PC board [A4P (1
Troubleshooting
Troubleshooting
Be sure to turn off power switch before connect or disconnect connector, or
Caution
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"- "09" blinks
again.
YES
Troubleshooting by Indication on the Remote Controller
ø ø
) or A5P (3 )]
NO
NO
NO
Unsatisfactory pressure equalization
Check refrigerant system.
Replace the inverter PC board
ø ø
assy [A4P (1 ) or A5P (3 )].
Reset and restart.
Compressor inspection
Inspect according to the diagnosis
procedure for odd noises, vibration
and operating status of the
compressor.
197