12 Disposal
Installer and user reference guide
39
RXYSQ4~6TAY1B
VRV IV-S system air conditioner
4P482257-1 – 2017.03
Main code
Cause
Solution
High pressure sensor malfunction (S1NPH): open circuit /
short circuit - A1P (X32A)
Check connection on PCB or actuator.
Low pressure sensor malfunction (S1NPL): open circuit /
short circuit - A1P (X31A)
Check connection on PCB or actuator.
Transmission outdoor unit - inverter: INV1 / FAN1 / FAN2
transmission trouble - A1P (X20A, X28A)
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.
12
Disposal
Dismantling of the unit, and treatment of the refrigerant, oil and other
parts must comply with the applicable legislation.
