Service manual

Troubleshooting by Indication on the Remote Controller SiUS28-902_a
115 Troubleshooting
3.24 “J5” Outdoor Unit: Malfunction of Thermistor (R3T, R5T)
for Suction Pipe 1, 2
Remote
Controller
Display
J5
Applicable
Models
RZQ18~30PVJU
Method of
Malfunction
Detection
Malfunction is detected from the temperature detected by the thermistor for suction pipe 1, 2.
Malfunction
Decision
Conditions
When a short circuit or an open circuit in the thermistor for suction pipe 1, 2 are detected.
Supposed
Causes
 Defect of thermistor (R3T, R5T) for outdoor unit suction pipe
 Defect of outdoor unit P.C.B. (A1P)
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.
Resistance
is normal when
measured after
disconnecting the thermistor
(R3T, R5T) from the
outdoor unit P.C.B.
(3.5kΩ~
360kΩ)
Replace the outdoor unit P.C.B.
(A1P).
Connect the thermistor and turn
on again.
NO
NO
Replace the thermistor (R3T, R5T).
YES
YES
Connector
of the thermistor for
suction pipe1, 2 is
connected to outdoor
unit P.C.B.
(A1P).