L5-00 - Outdoor Unit: Inverter Instantaneous Overcurrent - Daikin RXM20R Service Manual

3.5.27 L5-00 – Outdoor unit: Inverter instantaneous overcurrent
RXM20~71R(9) + ARXM25~71R(9) + FTXM20~71R + ATXM25~50R +
FVXM25~50A
Split New Perfera R32
ESIE20-11B – 2022.02
Prerequisite: Stop the unit operation via the user interface.
Prerequisite: Turn OFF the respective circuit breaker.
4 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.
5 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
An output overcurrent is
detected by checking the
current that flows in the
inverter DC section.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1 Check that all stop valves of the refrigerant circuit are open. See
"5.2 Refrigerant circuit" [
Possible cause: Closed stop valve in the refrigerant circuit.
2 Check if the refrigerant circuit is clogged. See
Possible cause: Clogged refrigerant circuit.
3 Check if the refrigerant circuit is correctly charged. See
4
circuit" [ 207].
Possible cause: Refrigerant overcharge or shortage.
4 Check for the presence of non‑condensables and/or humidity in the
refrigerant circuit. See
Possible cause: Non‑condensables and/or humidity in the refrigerant circuit.
5 Perform a check of the main PCB. See
Possible cause: Faulty main PCB.
6 Perform a check of the compressor. See "4.2 Compressor" [
Possible cause: Faulty compressor or miswiring of the compressor power
supply cable.
7 Check if the power supply is compliant with the regulations. See
4
circuit" [ 205].
Effect
Unit will stop operating.
4
207].
"5.2 Refrigerant
"5.2 Refrigerant circuit" [
"4.12 Main
3 Troubleshooting
|
Reset
Manual reset via user
interface.
4
circuit" [
"5.2 Refrigerant
4
207].
4
PCB" [ 125].
4 57].
"5.1 Electrical
Service manual
207].
35