Si20-701_B Troubleshooting by Remote Controller
486
[In cooling]
[In heating]
Defective suction air
thermistor of indoor unit
Defective outdoor air
temperature thermistor
of outdoor unit
Low suction air
temperature of outdoor
unit
Moisture choke
Inadequate refrigerant
quantity
Low suction
air
temperature
of the
evaporator
Less
circulation
quantity of
refrigerant
Short circuit
Low suction
air
temperature of
indoor unit
Low room
temperature
High pipe
resistance
Abnormal
piping length
Bent or
crashed pipe
Clogging of
foreign
materials
Stop valve
closed
← Is the suction air
temperature more than
14˚C?
← Is the room temperature
less than 14˚C?
← Is the outdoor air
temperature more than
-20˚C?
← Is the connector properly
connected?
Are the thermistor
resistance characteristics
normal?
← Is the connector properly
connected?
Are the thermistor
resistance characteristics
normal?
← Does the piping length fall
in the permissible range?
← Conduct visual checks for
pipe conditions.
← Is there any temperature
difference caused before
and after the filter or
branch pipe?
← Refer to error code "U1".
← Eliminate moisture by
vacuum operation.
Dirty evaporator
Degradation
in
condensing
capacity
Decreased
airflow
rate
Decreased
fan output
Defective
fan motor
Dirty filter
Obstacle
Defective
service
monitor
PCB
(Including
capacity
setting)
High
airflow
passage
resistance
← Is the heat exchanger
clogged?
← Can the fan motor
be rotated with
hands?
Are the motor coil
resistance and
insulation normal?
← If a spare PCB is
mounted, is the
capacity setting
properly made?
← Is the air filter
clogged?
← Is there any
obstacle in the
airflow passage?
A
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