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16.5.19 Tank Temperature Sensor Abnormality (H72)
Malfunction Decision Conditions:
When tank connection is set to ON, the temperatures detected by the tank temperature sensor are used to
determine sensor error.
Malfunction Caused:
1 Faulty
connector
connection.
2 Faulty
sensor.
3 Faulty indoor unit PCB (main).
Abnormality Judgment:
Continue for 5 seconds.
Check the tank temperature sensor:
- Plug out connector from the indoor unit PCB (main)
- Measure the resistance of the tank temperature
sensor
- Defect in tank temperature sensor
- Replace the tank temperature
sensor
Yes
Is the measured resistance of the
tank temperature sensor matches the
value specified in its characteristic
chart?
No
Check the terminal board assembly no. 15 and
no. 16, and CN-TH2 connector connections:
- Turn OFF the power
- Check the connector connections
- Connector poor contact
- Correct the connection
No
Is the terminal board assembly
no.15 and no. 16, and CN-TH2
connector connections normal?
- Defect in indoor unit PCB (main)
- Replace the indoor unit PCB (main)
Yes
Is the abnormality happened during
tank connection set to ON?
- Defect in indoor unit PCB (main)
- Replace the indoor unit PCB (main)
Yes
No
Troubleshooting:
For safety reason and to prevent component breakdown,
always switch off the power before remove and connect the component.
Caution