Daikin R71FUV1 Service Manual page 172

Troubleshooting by Remote Controller
Defective outdoor unit PCB
Abnormal drop of low pressure
(Inadequate refrigerant)
(Defective refrigerant piping system (liquid pipe
system))
(Defective electronic expansion valve)
Troubleshooting
Caution
Check the installation
conditions
Is the stop
valve open?
YES
Is it in cooling
operation?
YES
(In cooling)
A
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
may be damaged.
NO
NO (In heating)
Is the
intermediate
heat exchanger
thermistor properly
connected to the
outdoor unit
PCB?
B
Si20-701_B
Open the stop
valve.
NO
Connect the
connector
properly.
165