197
16.5.37 Low Discharge Superheat (F29)
Malfunction Decision Conditions:
During startup and operation of cooling and heating, the temperatures detected by the outdoor pipe temperature
sensor are used to determine sensor error.
Malfunction Caused:
1 Faulty
connector
connection.
2 Faulty
sensor.
3 Faulty outdoor unit PCB (main).
4 Faulty High Pressure Switch
5 Refrigerant shortage (refrigerant leakage).
Abnormality Judgment:
1 times occurrence within 2550 minutes.
No
Yes
Yes
Check the CN-DIS & CN-TH1 connection:
- Turn OFF the power.
- Check the connector connection.
- Is the CN-DIS & CN-TH1 connector normal?
- Measured the resistance of the sensor, is
the measured resistance matches the value
specified in its characteristic chart?
- Defect in Outdoor Unit PCB.
- Replace the Outdoor Unit PCB.
Check Refrigeration Cycle Pressure.
Is the refrigerant cycle pressure normal?
- Replace the temperature
Sensor.
No
- Recharge Gas.
Compressor Tank / Compressor Discharge Sensor
Characteristic
-10
0
10
20
30
40
50
150
200
250
300
350
100
50
0
Temperature (°C)
Outdoor Pipe / Outdoor Defrost Sensor
Characteristic
-10
0
10
20
30
40
50
15
20
25
30
10
5
0
Temperature (°C)
R
e
si
st
anc
e
(K
Ω
)
R
e
si
st
anc
e
(K
Ω
)
Troubleshooting:
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
Caution
