3
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Components
Service manual
84
(A)(F)TXF20~71A + FTXF20~25B + (A)(F)TXF20~42C + (A)(F)TXF20~42D +
(A)(F)TXF20~42E + (A)RXF20~71A + RXF20~60B + (A)RXF20~42C +
(A)RXF20~42D + (A)RXF20~42E
Split Sensira R32
ESIE18-12G – 2023.01
3.7 Indoor unit main PCB
3.7.1 Checking procedures
INFORMATION
It is recommended to perform the checks in the listed order.
To perform a power check of the indoor unit main PCB
Prerequisite:
Stop the unit operation via the user interface.
Prerequisite:
Turn OFF the respective circuit breaker.
Prerequisite:
Remove the required plate work, see
124].
1
Turn ON the power of the unit.
2
Measure the voltage between the black and white wires on the PCB. The
measured voltage MUST be 230 V AC.
a
b
a
Black wire
b
White wire
Is the measured voltage on the indoor
unit PCB correct?
Action
Yes
84] of the indoor unit
PCB and continue with the next
procedure.
No
Continue with the next step.
3
Check the power supply to the indoor unit, see
Is the power supply to the indoor unit
correct?
Action
Yes
Correct the wiring between the power
supply terminal of the indoor unit and
the indoor unit PCB, see
86].
No
See "To check the power supply to the
indoor unit" (