Daikin Super multi NX E Series Service Manual page 221

SiBE121135_A
Troubleshooting
Check No.01
Refer to P.230
Check No.12
Refer to P.234
Check No.13
Refer to P.235
Check No.14
Refer to P.235
Note: OL (Q1L) activating temperature: 120°C
OL (Q1L) recovery temperature: 95°C
Service Diagnosis
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Discharge
pipe thermistor
disconnected?
NO
Check No. 01
Check the thermistors.
OK
Connectors are
properly connected?
YES
Disconnect the connector [S40]
from the PCB.
Check
Resistance
the resistance
between the 2 terminals on
the connector
[S40].
Nearly 0 Ω
Check No. 12
Check the outdoor electronic
expansion valve.
OK
Check No. 13
Check the four way
valve.
OK
Check No. 14
Check the refrigerant
line.
OK
YES
NG
∗ Discharge pipe thermistor
NO
∗ Connector [S40]
∗ 2 terminals of OL (Q1L)
∞
Disconnect the 2 terminals of
the OL (Q1L).
Check the
resistance between the
2 terminals of the OL
(Q1L).
Nearly 0 Ω
NG
NG
NG
∗ Refrigerant shortage
∗ Water mixed
∗ Stop valve
Troubleshooting for Outdoor Unit
Insert the thermistor in
position.
Replace the discharge pipe
thermistor.
Connect the connectors
properly.
Resistance
∞
Replace the OL (Q1L).
Replace the OL harness.
Replace the outdoor
electronic expansion valve
or the coil.
Replace the four way valve
or the coil.
Replace the outdoor unit
PCB.
Refer to the refrigerant line
check procedure.
Replace the outdoor unit
PCB.
(R18333)
210