12 Disposal
Installer and user reference guide
40
RXYSQ4~6T8V/YB
VRV IV-S system air conditioner
4P482277-1 – 2017.04
Main code Cause Solution
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.
12 Disposal
NOTICE
Do not try to dismantle the system yourself: the dismantling
of the system, treatment of the refrigerant, oil and other
parts must comply with applicable legislation. Units must
be treated at a specialised treatment facility for reuse,
recycling and recovery.
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