Daikin VRV IV+ - Page 156

24 | Troubleshooting
Installer and user reference guide
156
REYQ8~20+REMQ5U7Y1B
VRV IV+ heat recovery
4P561154-1A – 2020.10
Main code Sub code Cause Solution
Master Slave 1 Slave 2
Discharge temperature sensor
malfunction (R21T): open
circuit – main PCB (X19A)
Check connection on PCB or
actuator.
Discharge temperature sensor
malfunction (R21T): short
circuit - main PCB (X19A)
Check connection on PCB or
actuator.
Discharge temperature sensor
malfunction (R22T): open
circuit - main PCB (X19A)
Check connection on PCB or
actuator.
Discharge temperature sensor
malfunction (R22T): short
circuit - main PCB (X19A)
Check connection on PCB or
actuator.
Compressor casing
temperature sensor
malfunction (R15T): open
circuit - main PCB (X19A)
Check connection on PCB or
actuator.
Compressor casing
temperature sensor
malfunction (R15T): short
circuit - main PCB (X19A)
Check connection on PCB or
actuator.
Suction compressor
temperature sensor (R12T) –
sub PCB (X15A)
Check connection on PCB or
actuator.
Suction temperature sensor
(R10T) – main PCB (X29A)
Check connection on PCB or
actuator.
Heat exchanger deicer
temperature sensor (R11T) –
sub PCB (X15A)
Check connection on PCB or
actuator
Upper heat exchanger – gas -
temperature sensor (R8T) –
main PCB (X29A)
Check connection on PCB or
actuator.
Lower heat exchanger – gas -
temperature sensor (R9T) main
PCB (X29A)
Check connection on PCB or
actuator.
Liquid main - temperature
sensor (R3T) – main PCB (X30A)
Check connection on PCB or
actuator.
Subcool heat exchanger – liquid
- temperature sensor (R7T) -
main PCB (X30A)
Check connection on PCB or
actuator.