C4" Indoor Unit: Malfunction Of Thermistor (R2T) For Heat Exchanger - Daikin VRVIII-S Service Manual

SiENBE34-703
3.9 "C4 " Indoor Unit: Malfunction of Thermistor (R2T) for
Heat Exchanger
C4
remote control
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 ! Defect of thermistor (R2T) for liquid pipe
! Defect of indoor unit PC board
Causes
Troubleshooting
∗ Refer to thermistor resistance / temperature characteristics table on P225.
Troubleshooting
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Connector is
NO
connected to X12A of
the indoor unit PC
board.
YES
Resistance is
normal when
measured after
NO
disconnecting the
thermistor (R2T)
from the indoor
unit PC board
(3.5kΩ~360kΩ)
YES
Troubleshooting by Indication on the remote control
Connect the thermistor and turn
on again.
Replace the thermistor (R2T).
Replace the indoor unit PC board.
(V2784)
133