Discharge Pipe Temperature Control - Daikin 2MXS-W Series Service Manual

SiUS122226E

7.13 Discharge Pipe Temperature Control

F3
Error Code
Outdoor Unit LED A j 1 i 2 h 3 i 4 h 5 h
Display
Method of Error
An error is determined with the temperature detected by the discharge pipe thermistor.
Detection
Error Decision
 If the temperature detected by the discharge pipe thermistor rises above A, the compressor
Conditions
 The error is cleared when the discharge pipe temperature is dropped below B.
 If the error repeats, the system is shut down.
 Reset condition: Continuous run for about 60 minutes without any other error
A
B
Supposed  Defective discharge pipe thermistor
Causes
 Defective electronic expansion valve or coil
 Refrigerant shortage
 Defective four way valve
 Water mixed in refrigerant
 Defective stop valve
 Defective outdoor unit PCB
Troubleshooting
Reference
Check No.01 Refer to P.224
Reference
Check No.12 Refer to P.227
Reference
Check No.14 Refer to P.229
Part 6 Service Diagnosis
stops.
2MXS
°C °F
120 248
95 203
(Defective outdoor heat exchanger thermistor or outdoor temperature thermistor)
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
3/4/5MXS 2/3/4MXL(H)
°C °F °C
120 248 120
107 224.6 107
NG
∗ Discharge pipe thermistor
∗ Outdoor heat exchanger thermistor
∗ Outdoor temperature thermistor
NG
NG
∗ Refrigerant shortage
∗ Four way valve
∗ Water mixed
∗ Stop valve
Troubleshooting for Outdoor Unit
°F
248
224.6
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)
207