C4" Malfunction Of Heat Exchange Temperature Sensor System - Daikin SkyAir RZQ200 · 250C7Y1B Service Manual

SiBE26-701
4.11 "C4" Malfunction of Heat Exchange Temperature Sensor
System
C4
Remote
Controller
Display
Applicable All indoor unit models
Models
Method of Malfunction detection is carried out by temperature detected by heat exchanger sensor.
Malfunction
Detection
Malfunction When the heat exchanger thermistor becomes disconnected or shorted while the unit is running.
Decision
Conditions
Supposed
Causes
Troubleshooting
Troubleshooting
Failure of the sensor itself
Broken or disconnected wire
Failure of electronic circuitry (indoor unit PC board)
Failure of connector contact
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Check contact of connector
Is it normal?
YES
Disconnect the heat exchange
sensor (R2T) from X18A on
the indoor unit PC board and
measure the resistance.
Is the
thermistor normal?
(See note)
YES
See Check No. 6 for "Thermistor temperature/Resistance characteristics".
NO
NO
Diagnosis by Remote Controller
Connect correctly.
Heat exchanger
senser replacement.
If contact is OK,
replace indoor unit
PC board.
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