8 Troubleshooting
Installation and operation manual
30
8T7Y1B
VRV IV compressor unit for indoor installation
4P408443-1B – 2016.04
In case of 8 HP:
Main code
Sub code
Cause
Solution
▪ Heat exchanger fan malfunction.
▪ Drain pump feedback contact is open.
In the heat exchanger unit:
▪ Check connection on PCB: A1P (X15A)
▪ Check connection on terminal block (X2M)
▪ Check the fan connectors.
Earth leakage detector activated
Compressor unit: (T1A) - A1P (X101A)
Restart the unit. If the problem reoccurs, contact
your dealer.
No earth leakage detector detected
Compressor unit: (T1A) - A1P (X101A)
Replace the earth leakage detector.
High pressure switch was activated
Compressor unit: (S1PH) - A1P (X4A)
Check stop valve situation or abnormalities in
(field) piping or airflow over air cooled coil.
▪ Refrigerant overcharge
▪ Stop valve closed
▪ Check refrigerant recharge unit.
▪ Open stop valves
Stop valve closed (liquid)
Open liquid stop valve.
▪ Refrigerant overcharge
▪ Stop valve closed
▪ Check refrigerant recharge unit.
▪ Open stop valves.
Low pressure malfunction:
▪ Stop valve closed
▪ Refrigerant shortage
▪ Indoor unit malfunction
▪ Open stop valves.
▪ Check refrigerant recharge unit.
▪ Check
the
user
interface's
display
or
transmission wiring between the outdoor unit
and the indoor unit.
Electronic expansion valve malfunction (subcool)
Compressor unit: (Y1E) - A1P (X21A)
Check connection on PCB or actuator.
Electronic expansion valve malfunction (main)
Heat exchanger unit: (Y1E) - A1P (X7A)
Check connection on PCB or actuator.
Discharge temperature too high:
▪ Stop valve closed
▪ Refrigerant shortage
Compressor unit: (R21T) - A1P (X29A)
▪ Open stop valves.
▪ Check refrigerant recharge unit.
▪ Refrigerant overcharge
▪ Stop valve closed
▪ Check refrigerant recharge unit.
▪ Open stop valves.
Ambient temperature sensor malfunction
Heat exchanger unit: (R1T) - A1P (X16A)
Check connection on PCB or actuator.
Discharge temperature sensor malfunction
Compressor unit: (R21T): open circuit - A1P
(X29A)
Check connection on PCB or actuator.
Discharge temperature sensor malfunction
Compressor unit: (R21T): short circuit - A1P
(X29A)
Check connection on PCB or actuator.
Heat exchanger gas sensor malfunction
Heat exchanger unit: (R2T) - A1P (X18A)
Check connection on PCB or actuator.
Suction temperature sensor malfunction
Compressor unit: (R3T) - A1P (X30A)
Check connection on PCB or actuator.
Suction temperature sensor malfunction
Compressor unit: (R7T) - A1P (X30A)
Check connection on PCB or actuator.
De-icing temperature sensor malfunction
Heat exchanger unit: (R3T) - A1P (X17A)
Check connection on PCB or actuator
Liquid temperature sensor (after subcool HE)
malfunction
Compressor unit: (R5T) - A1P (X30A)
Check connection on PCB or actuator.
Gas temperature sensor (after subcool HE)
malfunction
Compressor unit: (R6T) - A1P (X30A)
Check connection on PCB or actuator.
Summary of Contents for VRV IV RKXYQ8T7Y1B
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