Service manual

Troubleshooting by Indication on the Remote Controller SiUS28-902_a
125 Troubleshooting
Troubleshooting
Caution
Be sure to turn off the power switch before connecting or disconnecting
the connector, or parts could be damaged.
Output current check
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 outdoor unit P.C.B.
(A1P).
YES
NO
Reset and restart.
NO
The
secondary
current of the inverter
is higher than X16.8A,
260sec. for
each phase.
Replace the compressor.
NO
YES
Compressor
inspection The
compressor's coil is
disconnected.
YES
YES
Disconnect the the connection
between the compressor and
inverter. Make the power
transistor check mode setting
ON by service mode.
After turning
on again, "
L8" blinks
again.