A9-02 - Y1E Expansion Valve Body Abnormality - Daikin VAM350J8VEB Service Manual

3 | Troubleshooting
3.2.15 A9-02 – Y1E Expansion valve body abnormality
Service manual
32
draft – 07/02/2022 15:12
2 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 External factors.
Possible cause: External source may cause interference.
3 Perform a check of the indoor unit expansion valve. See Expansion valve.
Possible cause: Faulty expansion valve.
4 Perform a check of the indoor unit main PCB. See Indoor unit PCB.
Possible cause: Faulty indoor unit main PCB.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
EKVDX-A units
Trigger
Difference between gas
temperature and liquid
temperature too high or
liquid temperature too
low during cooling
operation, thermostat
OFF.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1 Check the power supply to the indoor unit. See Power supply.
Possible cause:
▪ Faulty or disturbance of the power supply (imbalance),
▪ Phase missing,
▪ Power drop,
▪ Short circuit.
2 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 External factors.
Possible cause: External source may cause interference.
3 Perform a check of the indoor unit refrigerant gas thermistor. See
Thermistors.
Possible cause: Faulty refrigerant gas thermistor or connector fault.
4 Perform a check of the indoor unit refrigerant liquid thermistor. See
Thermistors.
Possible cause: Faulty refrigerant liquid thermistor.
5 Perform a check of the indoor unit expansion valve. See Expansion valve.
Effect
The indoor unit with this
error will stop refrigerant
flow (expansion valve
OFF) and VAM unit will
resume fan operation (fan
ON). All other indoor units
and outdoor unit will
continue operating.
Reset
Power reset of indoor
unit.
VAM350~2000J8VEB + EKVDX32~100A2VEB
VRV system air conditioner
ESIE22-07 – 2022.02