Daikin VRV-WIII RWEYQ72PTJU Service Manual page 222

Troubleshooting by Indication on the Remote Controller
Troubleshooting
1: Check the low pressure value by using pressure gauge in operation.
Note:
2: Compare the actual measurement value by pressure sensor with the value by the pressure
3: Compare the thermistor resistance value with the value on the surface thermometer.
214
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
In cooling
Set up a pressure gauge at the service port on the low
pressure side.
Reset the operation using the remote controller then
restart.
Check if the
low pressure is 14.5 psi
or below. (*1)
YES
In heating
Reset the operation using the remote controller then restart.
Check if
the temperature
difference between the
suction pipe and the heat
exchanger is 68 °F and
over.
YES
gauge.
(To gain actual measurement value by pressure sensor, measure the voltage at the connector
[between (2)-(3)] and then convert the value into pressure referring to P.251.)
CHECK 2 Refer to P.242.
CHECK 3 Refer to P.243.
Check if the
NO
property of low
pressure sensor is
normal.
(*2)
YES
Check if
the property of
suction pipe thermistor
NO
(R2T) and heat exchanger
thermistor (R4T) are
normal.
(*3)
YES
SiUS30-1301
NO
Replace the low pressure
Replace the condensing
unit main PCB (A1P).
Remove the factor of
decreasing low pressure by
referring to CHECK 2 .
NO
Replace the thermistor.
Replace the condensing unit
main PCB.
• With individual systems,
replace the service monitor
PCB 1 (A1P) or the service
monitor PCB 3 (A3P).
• With multi systems, replace
the condensing unit main
PCB (A1P).
Remove the factor of
superheating by referring to
CHECK 3 .
Service Diagnosis