Daikin VRV IV+ Service Manual page 46

2 | Troubleshooting
2.3.26 E9-20-21-22 – Electronic Expansion Valve (Y1E) failure
Service manual
46
Possible cause: Faulty main PCB.
2 Perform a check of the Sub PCB. See
Possible cause: Faulty Sub PCB.
3 Perform a check of the lower heat exchanger expansion valve. See
"3.7 Expansion valve" [
Possible cause: Faulty lower heat exchanger expansion valve.
4 Perform a check
"3.21 Thermistors" [
Possible cause: Faulty refrigerant side thermistor(s).
5 Perform a check of the refrigerant low pressure sensor. See
low pressure sensor" [
Possible cause: Faulty refrigerant low pressure sensor.
6 Check if the refrigerant circuit is correctly charged. See
4
circuit" [ 363].
Possible cause: Refrigerant overcharge.
7 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.
8 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.
Main error code
E9
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
Upper heat exchanger
expansion valve Y1E
malfunction.
"3.20 Sub
4
244].
of all refrigerant
4
348].
4
333]
4
372].
Sub error code
20
21
22
Effect
Unit will stop operating.
4
PCB" [ 342].
side thermistors.
"3.18 Refrigerant
"4.2 Refrigerant
"4.1 Electrical
Unit
Main
Sub 1
Sub 2
Reset
Power reset at outdoor
unit.
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
See