Daikin 2MXU40GV1B User Manual

SiBE12-908 Troubleshooting
Service Diagnosis 138
2.21 Discharge Pipe Temperature Control
Remote
Controller Display
F3
Method of
Malfunction
Detection
Discharge pipe temperature control (stop, frequency attenuation, etc.) is executed based on the
temperature detected by the discharge pipe thermistor.
Malfunction
Decision
Conditions
If the temperature being detected by the discharge pipe thermistor rises, the compressor stops.
The temperature at which the compressor halts varies according to the frequency.
(1) 110°C when the frequency is above 30Hz on ascending or above 25Hz on descending.
(2) 108°C when the frequency is below 30Hz on ascending or below 25Hz on descending.

The error is cleared when the temperature has dropped below 95°C.

If the compressor stops 4 times successively due to abnormal discharge pipe temperature,
the system is shut down.

The error counter resets itself if this or any other error does not occur during the following
60-minute compressor running time (total time).
Supposed
Causes

Refrigerant shortage

Faulty operation of four way valve

Defective discharge pipe thermistor
(Defective heat exchanger thermistor or outdoor air thermistor)

Defective outdoor unit PCB

Water mixed in the field piping

Defective electronic expansion valve

Defective stop valve
Troubleshooting
Check No.02
Refer to P.169
Check No.12
Refer to P.172
Check No.17
Refer to P.176
(R9442)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Check the
thermistors.
Check No. 02
Malfunctioning
Functioning
Replace the defective
thermistor.
Malfunctioning
Malfunctioning
Functioning
Functioning
Check the electronic
expansion valve.
Check No. 17
Check the
refrigerant line.
Check No. 12
z
Discharge pipe thermistor
z
Outdoor unit heat exchanger thermistor
z
Outdoor temperature thermistor
z
Refrigerant shortage
z
Four way valve malfunctioning
z
Water mixed
z
Stop valve defective
Replace the valve itself or
the coil.
Refer to the refrigerant line
check procedure.
Replace the outdoor unit
PCB.

Daikin 2MXU40GV1B Specifications

General

Brand	Daikin
Model	2MXU40GV1B
Category	Heat Pump
Language	English