Daikin E Series, Service Manual

Page: 379 / 453

Troubleshooting for Outdoor Unit SiAU18-715
366 Troubleshooting
7.7 Abnormal Discharge Pipe Temperature
Remote
Controller
Display
F3
Applicable
Models AII outdoor unit models
Method of
Malfunction
Detection Abnormality is detected according to the temperature detected by the discharge pipe
temperature sensor.
Malfunction
Decision
Conditions When the discharge pipe temperature rises to an abnormally high level
When the discharge pipe temperature rises suddenly
Supposed
Causes
„
Faulty discharge pipe temperature sensor
„
Faulty connection of discharge pipe temperature sensor
„
Faulty outdoor unit PCB
Troubleshooting
∗
Refer to “Thermistor Resistance / Temperature Characteristics” table on P405.
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Pull out the discharge pipe
thermistor from the outdoor
PCB, and then make
measurement of resistance
using a multiple meter.
Discharge pipe
temperature is 120˚C or
higher when the unit stop
by malfunction.
Are the
characteristics
of the discharge pipe
thermistor normal?
(3.5~400K
Ω
)
∗
Replace outdoor unit PC
board (A1P).
(Q0556)
Refrigerant shortage,
compression defect, etc.
Defect of the refrigerant
system.
YES
Replace the discharge
pipe thermistor.
NO
NO
YES