Daikin VRV S RXQ4/5ARV1 Service Manual page 300

Troubleshooting by Error Code
Troubleshooting
Reference
CHECK 11 Refer to page 350.
Reference
CHECK 12 Refer to page 353.
294
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
YES
Is it cooling?
NO
Is the
temperature
difference between the suction YES
pipe and the outdoor heat
exchanger greater
than 20˚C?
NO
CHECK 11
Is the resistance
NO
measured from suction pipe
thermistor disconnected from
the outdoor unit main
PCB normal?
YES
Is the low pressure
NO
sensor normal?
YES
Is the low
pressure less or equal
to 0.25 MPa?
NO
CHECK 12
Is the voltage between
X18A pins (2) and (3) of outdoor unit
main PCB (A1P) less or equal to 1.0 VDC?
(Low pressure sensor output
voltage)
NO
SiAF332111E
YES
Refrigerant shortage, closed
stop valve, or blocked cooling
system. Check the refrigerant
system.
YES
Replace the outdoor unit main
PCB (A1P).
Replace the low pressure sensor.
Refrigerant shortage or blocked
cooling system. Check the
refrigerant system.
Replace the suction pipe
thermistor.
Replace the low pressure
sensor.
Replace the outdoor unit main
PCB (A1P).
Part 6 Service Diagnosis