Thermistor Or Related Abnormality (Indoor Unit) - Daikin E-Series Service Manual

SiAU18-715
4.4

Thermistor or Related Abnormality (Indoor Unit)

C4
Remote
Controller
Display
Method of The temperatures detected by the thermistors are used to determine thermistor errors.
Malfunction
Detection
Malfunction When the thermistor input is more than 4.96 V or less than 0.04 V during compressor
operation ∗ .
Decision
∗
Conditions
When above about 212°C (less than 120 ohms) or below about -50°C (more than 1,860 kohms).
Note: The values vary slightly in some models.
Supposed
Causes
Troubleshooting
Check No.06
Refer to P.329
C4
C9
Troubleshooting
C9
,
(reference)
Faulty connector connection
Faulty thermistor
Faulty PCB
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Check the connector connection.
Is it normal?
YES
Check No. 06
Check the thermistor resistance
value.
Is it normal?
YES
: Heat exchanger temperature thermistor
: Room temperature thermistor
NO
NO
Troubleshooting for RA Indoor Unit
Correct the connection.
Replace the thermistor.
(Replace the indoor unit PCB.)
Replace the indoor unit PCB.
(R7134)
327