C4 " Indoor Unit: Malfunction Of Thermistor (R2T) For; Heat Exchanger - Daikin VRV III REYQ8PY1 Service Manual

Troubleshooting by Indication on the Remote Controller
C4
" " Indoor Unit:
3.9

Heat Exchanger

C4
Remote
Controller
Display
Applicable All indoor unit models
Models
Method of Malfunction detection is carried out by temperature detected by heat exchanger thermistor.
Malfunction
Detection
Malfunction When the heat exchanger thermistor becomes disconnected or shorted while the unit is running.
Decision
Conditions
Supposed
Causes
Troubleshooting
∗
246
Malfunction of Thermistor (R2T) for
Defect of thermistor (R2T) for liquid pipe
Defect of indoor unit PC board
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Remove the thermistor from
the indoor unit PC board, and
then insert it again.
Is the
thermistor normal?
NO
Remove the thermistor from
the indoor unit PC board, and
then make resistance
measurement of the thermistor
using a multiple meter.
∗
5 kΩ to 90 kΩ
YES
Refer to "Thermistor Resistance / Temperature Characteristics" table on P417.
YES
NO
Si37-701
Normal (The malfunction is
caused by faulty contact.)
Replace the thermistor (R2T).
Replace the indoor unit PC board.
Troubleshooting