Daikin ERSQ 011AAV1, Service Manual

Page: 194 / 262

Troubleshooting by Indication on the Remote Controller ESIE09-08
182 Troubleshooting
3.43
“L8”
Indoor Unit: Inverter Current Abnormal
Remote Control
Display
L8
Subcode 10
Applicable
Models
All indoor units
Method of
Malfunction
Detection
Malfunction is detected by current flowing in the power transistor.
Malfunction
Decision
Conditions
When overload in the compressor is detected.
Supposed
Causes
„ Compressor overload
„ Compressor coil disconnected
„ Defect of indoor unit PC board [A4P (1
ø
) or A5P (3
ø
)]
„ Current protection (thermal)
Troubleshooting
Output current check
Caution
Inverter
output voltage
check Inverter output
voltage is not balanced
(Normal if within
±
5V). Must
be measured when
frequency is stable
Compressor overload
Inspection of the compressor and
refrigerant system is required
Compressor inspection
Inspect according to the diagnosis
procedure for odd noises, vibration
and operating status of the
compressor
NO
Replace the inverter PC board assy
[A4P (ø) or A5P (ø)]
YES
NO
Reset en Restart
NO
Replace the compressor
NO
YES
Compressor
inspection The
compressor's coil is
disconnected.
YES
YES
Disconnect the connection
between the compressor and
inverter. Make the power
transistor check mode setting
ON by service mode.
After
turning on again,
"
L8
- 10" blinks again.
The
secondary current
of the inverter is higher
than 13.1A, 260 sec for
each phase.