Daikin FTXA20AW - 2.11 Inverter PCB

2 | Components
Service manual
89
FTXA20~50A(W)(S)(T) + FTXA20~50B(B)(S)(T) + RXA42+50A +
RXA20~35A(9) + RXA42+50B
Split Stylish R32
ESIE18-03D – 2021.05
a
a Intelligent thermal sensor assembly
2 Route the intelligent thermal sensor harness inside the switch box, along the
harness retainers.
3 Connect the intelligent thermal sensor harness to the appropriate connector
on the indoor unit PCB.
WARNING
When reconnecting a connector to the PCB, make sure to connect it on the correct
location and do NOT apply force, as this may damage the connector or connector
pins of the PCB.
Is the problem solved? Action
Yes No further actions required.
No Return to the troubleshooting of the
specific error and continue with the
next procedure.
2.11 Inverter PCB
2.11.1 Checking procedures
As the inverter PCB is integrated in the main PCB of the unit, see "2.12 Main
PCB"[491] for the other check procedures.
To perform an electrical check of the inverter PCB
Prerequisite: Stop the unit operation via the user interface.
Prerequisite: Turn OFF the respective circuit breaker.
Prerequisite: Remove the required plate work, see "2.14Plate work"[4120].
1 Open the compressor insulation.
DANGER: RISK OF ELECTROCUTION
Wait for at least 10 minutes after the circuit breaker has been turned OFF, to be sure
the rectifier voltage is below 10VDC before proceeding.
2 Remove the cover of the compressor wire terminals.
3 Disconnect the wiring from the compressor wire terminals U, V and W.