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Troubleshooting by Indication on the Remote Controller
352
[In cooling]
If the indoor
unit electronic
expansion
valve is
throttled too
much:
(
∗
3)
[In heating]
If the outdoor
unit electronic
expansion
valve
excessively
throttled:
(
∗
4)
Defective
valve coil
Defective
valve body
Defective gas
pipe
thermistor of
indoor unit
Defective
thermistor for
indoor unit
liquid pipe
Defective
service
monitor PCB
Defective
indoor unit
electronic
expansion
valve
Defective
control
Defective
superheated
degree
control.
Refrigerant shortage
←
Are the coil resistance and
insulation normal?
←
Is the connector properly
connected?
Are the thermistor
resistance characteristics
normal?
←
Is the connector properly
connected?
Are the thermistor
resistance characteristics
normal?
Defective
valve coil
Defective
valve body
Defective low
pressure
sensor
Defective
suction pipe
thermistor
Defective
service
monitor PCB
Defective
outdoor unit
electronic
expansion
valve
Defective
control
←
Are the coil resistance and
insulation normal?
←
Are the electric
characteristics normal?
←
Does the piping length fall
in the permissible range?
←
Conduct visual checks
←
Eliminate moisture by
vacuum operation. (Refer
to [Check 13])
←
Check if the stop valve is
open.
←
Refer to [CHECK 12]
←
Is the connector properly
connected?
Are the thermistor
resistance characteristics
normal?
Abnormal piping length
Bent or crashed pipe
Stop valve closed
(Including moisture
choke)
High pipe
resistance
←
Is the pressure value
checked with the Service
Checker corresponding to
the measurement value of
the pressure sensor?
A