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