Daikin VRV IV+ Service Manual page 119

2.3.104 L5-03-05-07 – Output overcurrent detection on inverter PCB A3P
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
Main error code
L5
INFORMATION
Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit
configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is
connected. Main, Sub 1 and Sub 2 outdoor units can be identified by field setting
1‑00.
Trigger
Inverter PCB A3P detects
overcurrent to power
transistor.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1 Check if the power supply is conform with the regulations. See
4
circuit" [ 356].
Possible cause:
▪ Faulty or disturbance of the power supply (imbalance >10%),
▪ Power drop,
▪ Short circuit.
2 Check if the refrigerant circuit is clogged. See
Possible cause: Clogged refrigerant circuit.
3 Check that all stop valves of the refrigerant circuit are open. See
"4.2 Refrigerant circuit" [
Possible cause: Closed stop valve in the refrigerant circuit.
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 inverter PCB A3P. See
Possible cause: Faulty inverter PCB A3P.
6 Perform a check of the compressor M1C. See "3.3 Compressor" [
Possible cause: Faulty compressor M1C.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
Sub error code
03
05
07
Effect
Unit will stop operating.
"4.2 Refrigerant
4
363].
"4.2 Refrigerant circuit" [
"3.10 Inverter
2 Troubleshooting
|
Unit
Main
Sub 1
Sub 2
Reset
Manual reset via user
interface.
"4.1 Electrical
4
circuit" [
4
363].
4
PCB" [ 274].
4
221].
Service manual
363].
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