Indoor Unit, Outdoor Unit Mismatching Problem - Daikin RXM20R Service Manual

3.5.32 UA-00 – Indoor unit, outdoor unit mismatching problem
RXM20~71R(9) + ARXM25~71R(9) + FTXM20~71R + ATXM25~50R +
FVXM25~50A
Split New Perfera R32
ESIE20-11B – 2022.02
2 Perform a check of the power supply, connections, wiring,... between the
outdoor unit and the indoor unit. See
Possible cause: Faulty wiring between the outdoor unit and the indoor unit.
3 Perform a check of the main PCB. See
Possible cause: Faulty main PCB.
4 Perform a check of the outdoor unit fan motor. See
4
motor" [ 143].
Possible cause: Faulty outdoor unit fan motor.
5 Perform a check of the indoor unit main PCB. See
4
PCB" [ 106].
Possible cause: Faulty indoor unit main PCB.
6 Perform a check of the indoor unit power PCB. See
4
PCB" [ 112].
Possible cause: Faulty indoor unit power PCB.
Prerequisite: Stop the unit operation via the user interface.
Prerequisite: Turn OFF the respective circuit breaker.
7 Wait until the rectifier voltage is below 10 V DC.
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.
8 Check that the thermal interface grease is applied properly on the (PCB or
refrigerant piping) contact surface of the heat sink. Adjust if needed.
Possible cause: Thermal interface grease NOT applied properly on the heat
sink.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
Trigger
Signal transmission
between outdoor and
indoor unit abnormality.
Improper combination of
outdoor and indoor unit.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1 Check for improper combination of the indoor unit and the outdoor unit. See
the combination table in the Databook for more information.
"5.1 Electrical
"4.12 Main
Effect
Unit will stop operating.
3 Troubleshooting
|
4
circuit" [ 205].
4
PCB" [ 125].
"4.13 Outdoor unit fan
"4.9 Indoor unit main
"4.10 Indoor unit power
Reset
Power reset via outdoor
unit.
Service manual
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