Daikin FTXS30HVJU, Service Manual

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Troubleshooting SiUS04-924
78 Service Diagnosis
4.5 Thermistor or Related Abnormality (Indoor Unit)
Remote
Controller
Display
C4
,
C9
Method of
Malfunction
Detection
The temperatures detected by the thermistors are used to determine thermistor errors.
Malfunction
Decision
Conditions
When the thermistor input is more than 4.96 V or less than 0.04 V during compressor operation

.

(reference)
When above about 413.6°F(212°C) (less than 120

) or below about –58°F(–50°C) (more than
1,860 k

).
Note: The values vary slightly in some models.
Supposed
Causes

Faulty connector connection

Faulty thermistor

Faulty PCB
Troubleshooting
Check No.06
Refer to P.108
C4
: Heat exchanger thermistor
C9
: Room temperature thermistor
Caution
Be sure to turn off the power switch before connecting or disconnecting
the connector, or parts damage may occur.
Check the indoor and outdoor unit
model numbers.
YES
NO
NO
YES
Check the code numbers
(2P01234, for example) of the
indoor and outdoor unit PCB with
Match the compatible
models.
Replace the indoor unit
PCB (or the outdoor unit
PCB).
Change for the specified
PCBs.
Matched
compatibly?
Indoor unit and
outdoor unit matched?