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