Daikin RXYSQ4T8VB Series Installer And User Reference Manual page 124

24 | Troubleshooting
Main code
Liquid temperature sensor (after subcool HE)
malfunction (R7T) - A1P (X13A)
Gas temperature sensor (after subcool HE)
malfunction (R6T) - A1P (X13A)
High pressure sensor malfunction (S1NPH):
open circuit / short circuit - A1P (X17A)
Low pressure sensor malfunction (S1NPL): open
circuit / short circuit - A1P (X18A)
Transmission outdoor unit - inverter: INV1 /
FAN1 transmission trouble
INV1 unbalanced power supply voltage
Reversed power supply phase malfunction
Insufficient supply voltage
Malfunction code: System test run not yet
executed (system operation not possible)
No power is supplied to the outdoor unit.
Faulty wiring to Q1/Q2
System mismatch. Wrong type of indoor units
combined (R410A, R407C, RA, etc)
Indoor unit malfunction
Improper type of indoor units are connected.
Incorrect interconnections between units.
▪ The stop valve of an outdoor unit is left
closed.
▪ The piping and wiring of the specified indoor
unit are not connected correctly to the
outdoor unit.
Installer and user reference guide
124
Cause 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.
Check if power supply is within range.
Correct phase order.
Check if the supply voltage is supplied properly.
Execute system test run.
Check if the power wiring for the outdoor unit
is connected correctly.
Check Q1/Q2 wiring.
Check if other indoor units have malfunction
and confirm indoor unit mix is allowed.
Check the type of indoor units that are
currently connected. If they are not proper,
replace them with proper ones.
Connect interconnections F1 and F2 of the
connected BP unit correctly to the outdoor
unit's PCB (TO BP UNIT). Make sure that the
communication with the BP unit is enabled.
▪ Open the stop valve on both the gas and
liquid side.
▪ Confirm that the piping and wiring of the
specified indoor unit are connected correctly
to the outdoor unit.
RXYSQ4~6T8V/YB
VRV IV-S system air conditioner
4P482277-1B – 2020.10