Daikin VRV III-S RXYMQ36 48PVJU, Service Manual

Page: 159 / 264

Troubleshooting by Indication on the Remote Controller SiUS34-907
150 Troubleshooting
3.25 “
J7
” Malfunction of Thermistor (R7T) for Outdoor Unit
Liquid Pipe
Remote
Controller
Display
J7
Applicable
Models
RXYMQ36 · 48PVJU
Method of
Malfunction
Detection
Malfunction is detected from the temperature detected by the liquid pipe thermistor.
Malfunction
Decision
Conditions When a short circuit or an open circuit in the heat exchanger thermistor is detected
Supposed
Causes

Faulty liquid pipe thermistor 1 (R7T)

Faulty outdoor unit PCB

Defect of thermistor connection
Troubleshooting
∗
Refer to “Thermistor Resistance / Temperature Characteristics” table on P.241.
Replace the thermistor (R7T).
Is the
resistance
meas u red after
remo v ing the thermistor
(R7T) from o u tdoor u nit PCB
normal? (3.5k
W
to 360k
W
)
Is
the connector
for li qu id pipe thermistor
connected to X13A on o u tdoor
u nit PCB
(A1P)?
Replace the o u tdoor u nit PCB
(A1P).
N O
Connect the connector and
operate
u nit again.
N O
YES
Caution Be s u re to t u rn off the po w er s w itch b efore connecting or disconnecting the connector, or parts may b e damaged.
Confirm w hich thermistor is a b normal
u sing o u tdoor u nit "monitor mode".
(Refer to P.105, 106)
YES