L5" Outdoor Unit: Inverter Compressor Abnormal - Daikin FCQ18PVJU Service Manual

Troubleshooting by Indication on the Remote Controller
L5
3.30 " " Outdoor Unit: Inverter Compressor Abnormal
L5
Remote
Controller
Display
Applicable
RZQ18~30PVJU
Models
Method of
Malfunction is detected from current flowing in the power transistor.
Malfunction
Detection
Malfunction When an excessive current flows in the power transistor.
Decision (Instantaneous overcurrent also causes activation.)
Conditions
 Defect of compressor coil (disconnected, defective insulation)
Supposed
 Compressor start-up malfunction (mechanical lock)
Causes
 Defect of inverter P.C.B.
Troubleshooting
Higher voltage than actual is displayed when the inverter output voltage is checked by tester.
123
Be sure to turn off the power switch before connecting or disconnecting
Caution
the connector, or parts could be damaged.
Compressor inspection
The compressor's
coil is disconnected or the
insulation is
defective.
NO
Disconnect the connection
between the compressor and
inverter. Make the power
transistor check mode setting
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.
NO
There is
instantaneous power
drop.
NO
YES
YES
YES
SiUS28-902_a
Replace the compressor.
Replace the inverter unit.
Correct power supply.
Compressor inspection
Inspect according to the diagnosis
procedure for odd noises,
vibration, and operating status of
the compressor.
Troubleshooting