Daikin VRV IV+, Service Manual

Page: 113 / 476

2 | Troubleshooting
Service manual
113
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
2.3.99 L2-04-05-06 – Power supply abnormality during normal operation
Main error code Sub error code Unit
L2 04 Main
05 Sub 1
06 Sub 2
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 Effect Reset
Main PCB detects 50 Hz
zero-crossing error. Unit stops and retries
after guard timer (3
minutes) - infinite cycle. Automatic reset when
within zero-crossing
interval range.
Power reset at outdoor
unit.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
INFORMATION
Main PCB checks L1‑N on connector X1A for sinus waveform each time crossing the
zero‑line. Interval between each zero‑crossing is 10 miliseconds when the power
supply is 50 Hz.
1 Check if the power supply is conform with the regulations. See "4.1 Electrical
circuit" [ 4 356].
Possible cause:
▪ Faulty or disturbance of the power supply (imbalance >10%),
▪ Power drop,
▪ Short circuit.
2 Perform a check of the main PCB. See "3.11 Main PCB" [
4
290].
Possible cause: Faulty main PCB.
3 Perform a check of the inverter PCB(s). See "3.10 Inverter PCB" [
4
274].
Possible cause: Faulty inverter PCB(s).
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.