Daikin VRV IV+ Installation And Operation Manual page 42

19 Troubleshooting
Main code
Master
Installation and operation manual
42
Sub code
Slave 1 Slave 2
Gas temperature sensor (after subcool
HE) malfunction (R6T) - A1P (X30A)
High pressure sensor malfunction
(S1NPH): open circuit - A1P (X32A)
High pressure sensor malfunction
(S1NPH): short circuit - A1P (X32A)
Low pressure sensor malfunction
(S1NPL): open circuit - A1P (X31A)
Low pressure sensor malfunction
(S1NPL): short circuit - A1P (X31A)
Transmission outdoor unit - inverter:
INV1 transmission trouble - A1P
(X20A, X28A, X40A)
Transmission outdoor unit - inverter:
FAN1 transmission trouble - A1P
(X20A, X28A, X40A)
Transmission outdoor unit - inverter:
FAN2 transmission trouble - A1P
(X20A, X28A, X40A)
Transmission outdoor unit - inverter:
INV2 transmission trouble - A1P
(X20A, X28A, X40A)
INV1 unbalanced power supply
voltage
INV2 unbalanced power supply
voltage
Reversed power supply phase
malfunction
Reversed power supply phase
malfunction
INV1 voltage power shortage
INV1 power phase loss
INV2 voltage power shortage
INV2 power phase loss
Warning indication: Leak detection or
refrigerant amount check not
performed (system operation possible)
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
▪ Bad wiring between outdoor and
System mismatch. Wrong type of
indoor units combined (R410A,
R407C, RA, Hydrobox, etc)
Indoor unit malfunction
Cause
many indoor units
connected to F1/F2 line
indoor units
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.
Check connection.
Check connection.
Check connection.
Check if power supply is within range.
Check if power supply is within range.
Correct phase order.
Correct phase order.
Check if power supply is within range.
Check if power supply is within range.
Check if power supply is within range
Check if power supply is within range.
Execute autocharge function (see
manual); unit not ready for leak
detection functionality.
Execute system test run.
Check (Q1/Q2) wiring.
Check (Q1/Q2) wiring.
Execute test run again.
Check Q1/Q2 wiring.
Check Q1/Q2 wiring.
are Check indoor unit amount and total
capacity connected.
Check if other indoor units have
malfunction and confirm indoor unit
mix is allowed.
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546220-1C – 2020.10