Daikin RDXYQ5T8V1B Installer And User Manual page 127

Main code
Malfunction code: System test run not yet
executed (system operation not possible)
▪ No power is supplied to the compressor unit.
▪ Transmission wiring malfunction
▪ System mismatch. Wrong type of indoor units
combined (R410A, R407C, RA, etc). Indoor
unit malfunction
▪ Heat exchanger unit malfunction
▪ Improper type of indoor units are connected.
▪ Mismatch of compressor unit and heat
exchanger unit.
▪ 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.
Main code Sub code
RKXYQ5T8+8T7Y1B + RDXYQ5T8+8T7V1B
VRV IV heat pump for indoor installation
4P499898-1B – 2021.12
Cause
In case of 8 HP:
Cause
▪ Heat exchanger fan malfunction.
▪ Drain pump feedback contact is open.
Earth leakage detector activated
Compressor unit: (T1A) - A1P (X101A)
No earth leakage detector detected
Compressor unit: (T1A) - A1P (X101A)
High pressure switch was activated
Compressor unit: (S1PH) - A1P (X4A)
▪ Refrigerant overcharge
▪ Stop valve closed
Stop valve closed (liquid)
▪ Refrigerant overcharge
▪ Stop valve closed
22
Solution
Execute system test run.
▪ Check if all units are powered on.
▪ Check the transmission wiring.
▪ Check if other indoor units have malfunction
and confirm indoor unit mix is allowed.
▪ Check the transmission wiring to the 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.
▪ 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 the heat exchanger unit:
▪ Check connection on PCB: A1P (X15A)
▪ Check connection on terminal block
(X2M)
▪ Check the fan connectors.
Restart the unit. If the problem
reoccurs, contact your dealer.
Replace the earth leakage detector.
Check stop valve situation or
abnormalities in (field) piping or airflow
over air cooled coil.
▪ Check refrigerant amount+recharge
unit.
▪ Open stop valves
Open liquid stop valve.
▪ Check refrigerant amount+recharge
unit.
▪ Open stop valves.
Troubleshooting
|
Solution
Installer and user reference guide
127