Service manual

Troubleshooting by Indication on the Remote Controller SiUS28-902_a
111 Troubleshooting
3.20 “F3” Outdoor Unit: Abnormal Discharge Pipe
Temperature
Remote
Controller
Display
F3
Applicable
Models
RZQ18~30PVJU
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 P.C.B.
Troubleshooting
Refer to “Thermistor Resistance / Temperature Characteristics” table on P.166.
Caution
Be sure to turn off the power switch before connecting or disconnecting
the connector, or parts could be damaged.
Discharge
pipe temperature is
248°F or higher when the
unit stops by
malfunction.
Pull out the discharge pipe
thermistor from the outdoor
P.C.B., and then make
measurement of resistance
using a multiple meter.
Are
the characteristics
of the discharge pipe
thermistor normal?
(3.5~400kΩ)
*
Replace the outdoor unit P.C.B.
(A1P).
Replace the discharge pipe
thermistor.
NO
NO
Refrigerant shortage, compression
defect, etc. Defect of the refrigerant
system.
YES
YES