E9-26-27-28 - Expansion Valve Y4E Abnormality; E9-48-49-50 - Expansion Valve Overcurrent Error - Daikin VRV IV+ Service Manual

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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
page 138.
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.
2.3.27 E9-26-27-28 – Expansion valve Y4E
abnormality
INFORMATION
This error is ONLY applicable for RYYQ-U units.
Main error code Sub error code
E9 26
27
28
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 Effect
Storage vessel Unit will stop
expansion valve Y4E operating.
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
page 106.
Possible cause: Faulty main PCB.
2 Perform a check of the storage vessel expansion valve. See
"3.5 Expansion valve" on page 89.
Possible cause: Faulty storage vessel expansion valve.
3 Perform a check of all refrigerant side thermistors. See
"3.17 Thermistors" on page 128.
Possible cause: Faulty refrigerant side thermistor(s).
4 Perform a check of the refrigerant low pressure sensor. See
"3.16 Refrigerant low pressure sensor" on page 126
Possible cause: Faulty refrigerant low pressure sensor.
5 Check if the refrigerant circuit is correctly charged. See
"4.2 Refrigerant circuit" on page 133.
Possible cause: Refrigerant overcharge.
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ Heat Pump
ESIE18-14 – 2019.07
"4.3 External factors" on
Unit
Main
Sub 1
Sub 2
Reset
Power reset at
outdoor unit.
"3.9 Main PCB" on
6 Check if the power supply is conform with the regulations. See
"4.1 Electrical circuit" on page 130.
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
page 138.
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.
2.3.28 E9-48-49-50 – Expansion valve
overcurrent error
Main error code Sub error code
E9 48
49
50
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 Effect
Expansion valve Unit will stop
overcurrent. operating.
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
page 106.
Possible cause: Faulty main PCB.
2 Perform a check of all expansion valves. See
valve" on page 89.
Possible cause: Faulty expansion valve.
3 Perform a check of all refrigerant side thermistors. See
"3.17 Thermistors" on page 128.
Possible cause: Faulty refrigerant side thermistor(s).
4 Perform a check of the refrigerant low pressure sensor. See
"3.16 Refrigerant low pressure sensor" on page 126
Possible cause: Faulty refrigerant low pressure sensor.
5 Check if the refrigerant circuit is correctly charged. See
"4.2 Refrigerant circuit" on page 133.
Possible cause: Refrigerant overcharge.
6 Check if the power supply is conform with the regulations. See
"4.1 Electrical circuit" on page 130.
2 Troubleshooting
"4.3 External factors" on
Unit
Main
Sub 1
Sub 2
Reset
Power reset at
outdoor unit.
"3.9 Main PCB" on
"3.5 Expansion
Service manual
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