Daikin VRV IV+ Service Manual page 55

2.3.33 E9-51-52-53 – Electronic expansion valve thermal cutting error
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
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
Expansion valve thermal
cutting error.
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 Sub PCB. See
Possible cause: Faulty Sub PCB.
3 Perform a check of all expansion valves. See
Possible cause: Faulty 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.
Sub error code
51
52
53
Effect
Unit will stop operating.
"3.11 Main
"3.20 Sub
of all refrigerant
4
348].
4
333]
2 Troubleshooting
|
Unit
Main
Sub 1
Sub 2
Reset
Power reset at outdoor
unit.
4
PCB" [ 290].
4
PCB" [ 342].
4
"3.7 Expansion valve" [
side thermistors.
"3.18 Refrigerant
"4.2 Refrigerant
"4.1 Electrical
244].
See
Service manual
55