Daikin VRV IV+ Service Manual page 48

2 | Troubleshooting
Service manual
48
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
Subcool expansion valve
Y2E malfunction.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
INFORMATION
When the power is switched ON, the outdoor unit main PCB checks all expansion
valve coil windings by current check.
1 Perform a check of the main PCB. See
Possible cause: Faulty main PCB.
2 Perform a check of the subcool expansion valve. See
4
valve" [ 244].
Possible cause: Faulty subcool expansion valve.
3 Perform a check
"3.21 Thermistors" [
Possible cause: Faulty refrigerant side thermistor(s).
4 Perform a check of the refrigerant low pressure sensor. See
low pressure sensor" [
Possible cause: Faulty refrigerant low pressure sensor.
5 Check if the refrigerant circuit is correctly charged. See
4
circuit" [ 363].
Possible cause: Refrigerant overcharge.
6 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.
7 Perform a power reset. If the error disappears and is raised again after a
while, check for the presence of an external source causing electrical noise.
See "4.3 External factors" [
Possible cause: External source may cause interference.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
Effect
Unit will stop operating.
"3.11 Main
of all refrigerant
4
348].
4
333]
4
372].
Reset
Power reset at outdoor
unit.
4
PCB" [ 290].
"3.7 Expansion
side thermistors.
"3.18 Refrigerant
"4.2 Refrigerant
"4.1 Electrical
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
See