Daikin VRV IV Series - Page 127

22 | Troubleshooting
Installer and user reference guide
127
RKXYQ5T8+8T7Y1B + RDXYQ5T8+8T7V1B
VRV IV heat pump for indoor installation
4P499898-1B – 2021.12
Main code Cause Solution
Malfunction code: System test run not yet
executed (system operation not possible)
Execute system test run.
▪ No power is supplied to the compressor unit.
▪ Transmission wiring malfunction
▪ Check if all units are powered on.
▪ Check the transmission wiring.
▪ System mismatch. Wrong type of indoor units
combined (R410A, R407C, RA, etc). Indoor
unit malfunction
▪ Heat exchanger unit malfunction
▪ Check if other indoor units have malfunction
and confirm indoor unit mix is allowed.
▪ Check the transmission wiring to the heat
exchanger unit.
▪ Improper type of indoor units are connected.
▪ Mismatch of compressor unit and heat
exchanger unit.
▪ Check the type of indoor units that are
currently connected. If they are not proper,
replace them with proper ones.
▪ Check if the compressor unit and heat
exchanger unit are compatible.
▪ The stop valves of the compressor unit are
left closed.
▪ The piping and wiring of the specified indoor
unit or heat exchanger unit are not connected
correctly to the compressor unit.
▪ Open the stop valves on both the gas and
liquid side.
▪ Confirm that the piping and wiring of the
specified indoor unit or heat exchanger unit
are connected correctly to the compressor
unit.
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 amount+recharge
unit.
▪ Open stop valves
Stop valve closed (liquid) Open liquid stop valve.
▪ Refrigerant overcharge
▪ Stop valve closed
▪ Check refrigerant amount+recharge
unit.
▪ Open stop valves.