Discharge Pipe Temperature Control - Daikin 4MXS-R Series Service Manual

Troubleshooting for Outdoor Unit

7.12 Discharge Pipe Temperature Control

F3
Error Code
j
Outdoor Unit LED
A
Display
Method of Error An error is determined with the temperature detected by the discharge pipe thermistor.
Detection
Error Decision
Conditions
18 class
24/36 class
Supposed
Causes
Troubleshooting
Check No.01
Refer to P.209
Check No.12
Refer to P.212
Check No.14
Refer to P.213
195
i h i h
1 2 3 4
If the temperature detected by the discharge pipe thermistor rises above
stops.
The error is cleared when the discharge pipe temperature is dropped below
A
120°C (248°F)
120°C (248°F)
If the error repeats, the system is shut down.
Reset condition: Continuous run for about 60 minutes without any other error
Defective discharge pipe thermistor
(Defective outdoor heat exchanger thermistor or outdoor temperature thermistor)
Defective electronic expansion valve or coil
Refrigerant shortage
Defective four way valve
Water mixed in refrigerant
Defective stop valve
Defective outdoor unit PCB
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
95°C (203°F)
107°C (224.6°F)
NG
∗
Discharge pipe thermistor
∗
Outdoor heat exchanger thermistor
∗
Outdoor temperature thermistor
NG
NG
∗
Refrigerant shortage
∗
Four way valve
∗
Water mixed
∗
Stop valve
SiUS121736EA
, the compressor
A
B.
Replace the defective
thermistor(s).
Replace the electronic
expansion valve or the coil.
Refer to the refrigerant line
check procedure.
Replace the outdoor unit
PCB (main PCB).
(R20417)
Service Diagnosis