Troubleshooting for Outdoor Unit SiAU18-715
370 Troubleshooting
7.11 Malfunction of Thermistor (R3T, R5T) for Suction
Pipe1, 2
Remote
Controller
Display
J5
Applicable
Models
AII outdoor unit models
Method of
Malfunction
Detection
Malfunction is detected from the temperature detected by the thermistor for suction pipe 1, 2.
Malfunction
Decision
Conditions
When a short circuit or an open circuit in the thermistor for suction pipe 1, 2 are detected.
Supposed
Causes
Defect of thermistor (R3T, R5T) for outdoor unit suction pipe
Defect of outdoor unit PCB (A1P)
Troubleshooting
∗
Refer to thermistor resistance / temperature characteristics table on P405.
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Connector of
the thermistor for
suction pipe1, 2 is
connected to outdoor
unit PC board
(A1P).
Resistance
is normal when
measured after
disconnecting the thermistor
(R3T, R5T) from the
outdoor unit PC
board. (3.5kΩ ~
360kΩ)
Replace outdoor unit PC
board (A1P).
(Q0560)
Connect the thermistor and
turn on again.
NO
Replace the thermistor
(R3T, R5T).
NO
YES
YES
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