Daikin RTSQ20PY1 Service Manual page 308

Troubleshooting by Indication on the Remote Controller
Troubleshooting
297
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Check for power supply conditions.
(1) Is the power supply voltage
200VAC±10%?
(2) Does the power supply have any
open phase or erroneous wiring?
(3) Does the power supply imbalance
fall within 6V?
There is a defect in the
power supply
aforementioned.
NO
The insulation resistance
of the compressor is not
more than 100kΩ.
NO
The insulation resistance
of the fan motor is not
more than 1MΩ.
NO
CHECK 4 (P.341)
Is the power transistor
normal?
YES
Connect and disconnect the
following connectors.
(1) X4A (A2P) ⇔ X20A (A1P)
(2) X6A (A2P) ⇔ X28A (A1P)
The inverter PCB
gets damaged.
NO
A
YES
YES
YES
NO
YES
SiBE31-801_C
Rectify the defect.
Replace the compressor.
Replace the fan motor.
If the motor significantly gets
damaged, the inverter PCB
will need to be replaced.
Replace the inverter PCB.
Replace the inverter PCB.
If the inverter PCB significantly
gets damaged, the compressor
or the fan motor may have
caused a failure.
Troubleshooting