Specifications

RXYQQ8~20T7Y1B
VRV IV System Air Conditioner
4P345099-1 – 2013.04
Installation and operation manual
45
JA 06/08/10 High pressure sensor malfunction (S1NPH): open circuit -
A1P (X32A)
Check connection on PCB or actuator
07/09/11 High pressure sensor malfunction (S1NPH): short circuit -
A1P (X32A)
Check connection on PCB or actuator
JC 06/08/10 Low pressure sensor malfunction (S1NPL): open circuit - A1P
(X31A)
Check connection on PCB or actuator
07/09/11 Low pressure sensor malfunction (S1NPL): short circuit - A1P
(X31A)
Check connection on PCB or actuator
LC 14 Transmission outdoor unit - inverter: INV1 transmission
trouble - A1P (X20A, X28A, X40A)
Check connection
19 Transmission outdoor unit - inverter: FAN1 transmission
trouble - A1P (X20A, X28A, X40A)
Check connection
24 Transmission outdoor unit - inverter: FAN2 transmission
trouble - A1P (X20A, X28A, X40A)
Check connection
30 Transmission outdoor unit - inverter: INV2 transmission
trouble - A1P (X20A, X28A, X40A)
Check connection
P1 01/02/03 INV1 unbalanced power supply voltage Check if power supply is within range
07/08/09 INV2 unbalanced power supply voltage Check if power supply is within range
U1 01/05/07 Reversed power supply phase malfunction Correct phase order
04/06/08 Reversed power supply phase malfunction Correct phase order
U2 01/08/11 INV1 voltage power shortage Check if power supply is within range
02/09/12 INV1 power phase loss Check if power supply is within range
22/25/28 INV2 voltage power shortage Check if power supply is within range
23/26/29 INV2 power phase loss Check if power supply is within range
U3 03 Malfunction code: System test run not yet executed (system
operation not possible)
Execute system test run
U4 01 Faulty wiring to Q1/Q2 or indoor - outdoor Check (Q1/Q2) wiring
03 Faulty wiring to Q1/Q2 or indoor - outdoor Check (Q1/Q2) wiring
04 System test run abnormal ending Execute test run again
U7 01 Warning: faulty wiring to Q1/Q2 Check Q1/Q2 wiring
02 Malfunction code: faulty wiring to Q1/Q2 Check Q1/Q2 wiring
11 • Too many indoor units are connected to F1/F2 line
• Bad wiring between outdoor and indoor units
Check indoor unit amount and total capacity connected
U9 01 System mismatch. Wrong type of indoor units combined
(R410A, R407C).
Indoor unit malfunction.
Check if other indoor units have malfunction and confirm
indoor unit mix is allowed.
UA 18 Connection malfunction over indoor units or type mismatch
(R410A, R407C).
Check if other indoor units have malfunction and confirm
indoor unit mix is allowed.
31 Wrong unit combination (multi system) Check if unit types are compatible
49 Wrong unit combination (multi system) Check if unit types are compatible
UH 01 Auto address malfunction (inconsistency) Check if transmission wired unit amount matches with
powered unit amount (by monitor mode) or wait till
initialisation is finished.
UF 01 Auto address malfunction (inconsistency) Check if transmission wired unit amount matches with
powered unit amount (by monitor mode) or wait till
initialisation is finished.
05 Stop valve closed or wrong (during system test run) Open stop valves
INFORMATION
References can be found on the wiring diagram.
Malfunction code
Contents Solution
Main
code
Sub code
Master/slave 1/slave 2