Daikin VRV IV+ Service Manual page 52

2 | Troubleshooting
2.3.31 E9-44-45-46 – Electronic expansion valve (Y3E) failure
Service manual
52
Possible cause: Faulty auto charge 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.
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
Lower heat exchanger
expansion valve Y3E
malfunction.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
of all refrigerant
4
348].
4
333]
4
372].
Sub error code
44
45
46
Effect
Unit will stop operating.
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