Daikin VRV IV RKXYQ5T8Y1B Series Installation And Operation Manual page 41

Main code Sub code
RKXYQ5T8 + RKXYQ8T7Y1B
VRV IV compressor unit for indoor installation
4P499900-1A – 2020.10
Cause
Heat exchanger gas sensor malfunction
Heat exchanger unit: (R2T) - A1P (X18A)
Suction temperature sensor malfunction
Compressor unit: (R3T) - A1P (X30A)
Suction temperature sensor malfunction
Compressor unit: (R7T) - A1P (X30A)
De-icing temperature sensor malfunction
Heat exchanger unit: (R3T) - A1P (X17A)
Liquid temperature sensor (after subcool HE)
malfunction
Compressor unit: (R5T) - A1P (X30A)
Gas temperature sensor (after subcool HE)
malfunction
Compressor unit: (R6T) - A1P (X30A)
High pressure sensor malfunction
Compressor unit: (S1NPH): open circuit - A1P
(X32A)
High pressure sensor malfunction
Compressor unit: (S1NPH): short circuit - A1P
(X32A)
Low pressure sensor malfunction
Compressor unit: (S1NPL): open circuit - A1P
(X31A)
Low pressure sensor malfunction
Compressor unit: (S1NPL): short circuit - A1P
(X31A)
Transmission outdoor unit - inverter: INV1
transmission trouble
Compressor unit: A1P (X20A, X28A, X42A)
INV1 unbalanced power supply voltage
Heat exchanger unit capacity setting malfunction.
Reversed power supply phase malfunction
Reversed power supply phase malfunction
INV1 voltage power shortage
INV1 power phase loss
Malfunction code: System test run not yet
executed (system operation not possible)
Faulty wiring to Q1/Q2 or indoor - outdoor
Faulty wiring to Q1/Q2 or indoor - outdoor
System test run abnormal ending
Warning: faulty wiring to Q1/Q2
Malfunction code: faulty wiring to Q1/Q2
▪ Too many indoor units are connected to F1/F2
line
▪ Bad wiring between outdoor and indoor units
▪ System mismatch. Wrong type of indoor units
combined (R410A, R407C, RA, etc). Indoor unit
malfunction
▪ Heat exchanger unit malfunction
19 Troubleshooting
Solution
Check connection on PCB or actuator.
Check connection on PCB or actuator.
Check connection on PCB or actuator.
Check connection on PCB or actuator
Check connection on PCB or actuator.
Check connection on PCB or actuator.
Check connection on PCB or actuator.
Check connection on PCB or actuator.
Check connection on PCB or actuator.
Check connection on PCB or actuator.
Check connection.
Check if power supply is within range.
Check the type of heat exchanger unit. If
necessary, replace the heat exchanger unit.
Correct phase order.
Correct phase order.
Check if power supply is within range.
Check if power supply is within range.
Execute system test run.
Check (Q1/Q2) wiring. Do NOT use Q1/Q2.
Check (Q1/Q2) wiring. Do NOT use Q1/Q2.
Execute test run again.
Check Q1/Q2 wiring. Do NOT use Q1/Q2.
Check Q1/Q2 wiring. Do NOT use Q1/Q2.
Check indoor unit amount and total capacity
connected.
▪ Check if other indoor units have malfunction and
confirm indoor unit mix is allowed.
▪ Check the transmission wiring to the heat
exchanger unit.
Installation and operation manual
41