21 Troubleshooting
Installation and operation manual
51
REMA5+REYA8~20A7Y1B
VRV 5 heat recovery
4P684060-1 – 2022.02
Main
code
Sub code
Cause
Solution
SVEO
(a)
SVS
(b)
Master
Slave 1
Upper heat exchanger – liquid -temperature
sensor (R4T ) - main PCB (X30A)
Check connection on PCB or actuator.
Lower heat exchanger – liquid - temperature
sensor (R5T ) - main PCB (X30A)
Check connection on PCB or actuator.
Subcool heat exchanger – gas - temperature
sensor (R6T) – main PCB (X30A)
Check connection on PCB or actuator.
Receiver gas temperature sensor (R13T) –
main PCB (X46A)
Check connection on PCB or actuator.
High pressure sensor malfunction (S1NPH):
open circuit - main PCB (X32A)
Check connection on PCB or actuator.
High pressure sensor malfunction (S1NPH):
short circuit - main PCB (X32A)
Check connection on PCB or actuator.
Low pressure sensor malfunction (S1NPL):
open circuit - main PCB (X31A)
Check connection on PCB or actuator.
Low pressure sensor malfunction (S1NPL):
short circuit - main PCB (X31A)
Check connection on PCB or actuator.
Transmission outdoor unit - inverter: INV1
transmission trouble - main PCB (X20A,
X28A, X40A)
Check connection.
Transmission outdoor unit - inverter: FAN1
transmission trouble - main PCB (X20A,
X28A, X40A)
Check connection.
Transmission outdoor unit - inverter: FAN2
transmission trouble - main PCB (X20A,
X28A, X40A)
Check connection.
Transmission main PCB – sub PCB – main
PCB (X20A), sub PCB (X2A, X3A)
Check connection.
INV1 unbalanced power supply voltage
Check if power supply is within range.
Reversed power supply phase malfunction
Correct phase order.
Reversed power supply phase malfunction
Correct phase order.
INV1 voltage power shortage
Check if power supply is within range.
INV1 power phase loss
Check if power supply is within range.
Malfunction code: system test run not yet
executed (system operation not possible)
Execute system test run.
An error occurred during the test run
Re-execute the test run.
,
Test run aborted
Re-execute the test run.
,
Test run aborted due to communication
issues
Check the communication wires and re-
execute the test run.
Commissioning of BS unit safety system is
not completed
Complete commisioning of BS unit safety
system. Refer to BS unit manual for more
information.
Indoor unit communication error
Check user interface connection.
,
Malfunction code: faulty wiring to Q1/Q2
Check Q1/Q2wiring.
Too many indoor units are connected to F1/
F2 line
Check indoor unit amount and total capacity
connected.
Warning because there is an error on
another unit (indoor/BS unit)
Check if other indoor units/BS units have
malfunction and confirm indoor unit mix is
allowed.
Connection malfunction over indoor units or
type mismatch
Check if other indoor units have malfunction
and confirm indoor unit mix is allowed.
Connection malfunction over indoor units or
type mismatch
Check if other indoor units have malfunction
and confirm indoor unit mix is allowed.
Wrong unit combination (multi system)
Check if unit types are compatible.
Wrong outdoor unit connected
Disconnect the outdoor unit.
No BS unit connected
Connect a BS unit.
Old BS unit connected
Disconnect the BS unit.
BS unit refrigerant type abnormality
Check BS unit refrigerant type
BS unit DIP switch abnormality
Check the DIP switches of the BS unit.
