Troubleshooting Si12-411A
190 Service Diagnosis
5.16 Discharge Pipe Temperature Control
Remote
Controller
Display
F3
Outdoor Unit LED
Display
A
5
1
4
2
1
3
4
4
1
Method of
Malfunction
Detection
The discharge pipe temperature control (stop, frequency drooping, etc.) is checked with the
temperature being detected by the discharge pipe thermistor.
Malfunction
Decision
Conditions
If a stop takes place 6 times straight due to abnormal discharge pipe temperature, the
system will be shut down.
If the temperature being detected by the discharge pipe thermistor rises above 120°C, the
compressor will stop. (The error is cleared when the temperature has dropped below
107°C.)
Stop temperatures (in the case of 3MXS52BVMB)
(1) 110°C when the frequency rises above 45 Hz or drops below 40 Hz.
(2) 102°C when the frequency rises from 30 Hz to 45 Hz or drops from 40 Hz to 25 Hz.
(3) 98°C when the frequency rises just up to 30 Hz or drops below 25 Hz.
The error counter will reset itself if this or any other error does not occur during the following
60-minute compressor running time (total time).
Supposed
Causes
Refrigerant shortage
Four way valve malfunctioning
Discharge pipe thermistor defective
(heat exchanger or outdoor temperature thermistor defective)
Outdoor unit PCB defective
Water mixed in the local piping
Electronic expansion valve defective
Stop valve defective
Troubleshooting
Check No.4
Refer to P.207
Check No.6
Refer to P.209
Check No.11
Refer to P.212
Replace a defective
thermistor.
Replace the valve itself or
the coil.
Refer to the refrigerant line
check procedure.
Replace the outdoor unit
PCB.
(R2846)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Check No. 6
Check the thermistors.
Malfunctioning
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
Malfunctioning
Functioning
Functioning
Functioning
Check No. 11
Check the refrigerant line.
Malfunctioning
Check No. 4
Check the electronic expansion
valve.
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