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Troubleshooting
Service manual
49
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
2.3.28 E9-26-27-28 – Electronic expansion valve (Y4E) malfunction
Main error code
Sub error code
Unit
E9
26
Main
27
Sub 1
28
Sub 2
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
Reset
Receiver gas expansion
valve Y4E malfunction.
Unit will stop operating.
Power reset at outdoor
unit.
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
290].
Possible cause:
Faulty main PCB.
2
Perform a check of the Sub PCB. See
342].
Possible cause:
Faulty Sub PCB.
3
Perform a check of the receiver gas expansion valve. See
Possible cause:
Faulty receiver gas expansion valve.
4
Perform
a
check
of
all
refrigerant
side
thermistors.
See
348].
Possible cause:
Faulty refrigerant side thermistor(s).
5
Perform a check of the refrigerant low pressure sensor. See
Possible cause:
Faulty refrigerant low pressure sensor.
6
Check if the refrigerant circuit is correctly charged. See
Possible cause:
Refrigerant overcharge.
7
Check if the power supply is conform with the regulations. See
Possible cause:
▪
Faulty or disturbance of the power supply (imbalance >10%),
▪
Power drop,
▪
Short circuit.
Summary of Contents for VRV IV+
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