Discharge Pipe Temperature Control - Daikin Super Multi NX FFQ25B8V1B Service Manual

Troubleshooting for Outdoor Unit
7.7

Discharge Pipe Temperature Control

F3
Remote
Controller
Display
Outdoor Unit LED A
Display
Method of Detected by the discharge pipe thermistor
Malfunction
Detection
Malfunction
Decision
Conditions
50/52/58 class
68/75/80/90 class
Supposed
Causes
Troubleshooting
Check No.01
Refer to P.362
Check No.12
Refer to P.364
Check No.14
Refer to P.365
340
j i h i h
1 2 3 4
If the temperature detected by the discharge pipe thermistor rises above
compressor stops.
The error is cleared when the discharge pipe temperature is dropped below
A (°C)
110
120
If the error repeats 6 times, the system is shut down.
Reset condition: Continuous run for about 60 minutes without any other error
Refrigerant shortage
Defective four way valve
Defective discharge pipe thermistor
(Defective outdoor heat exchanger thermistor or outdoor temperature thermistor)
Defective outdoor unit PCB
Water mixed in refrigerant
Defective electronic expansion valve
Defective stop valve
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Check No. 01
Check the thermistors.
OK
Check No. 12
Check the electronic
expansion valve.
OK
Check No. 14
Check the refrigerant
line.
OK
h
5
B (°C)
95
107
NG
• Discharge pipe thermistor
• Outdoor heat exchanger thermistor
• Outdoor temperature thermistor
NG
NG
• Refrigerant shortage
• Four way valve
• Water mixed
• Stop valve
SiBE121021_C
°C, the
A
°C.
B
Replace the defective
thermistor.
Replace the electronic
expansion valve or the coil.
Refer to the refrigerant line
check procedure.
Replace the outdoor unit
PCB.
(R14412)
Service Diagnosis