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Troubleshooting 91
Testing method
Fault
Possible causes
Testing method
Defective sensor
Temperature sensor
connection fault
Check if the temperature sensor is open and if the connector is connected
properly.
Temperature sensor fault
Check the resistance of the temperature sensor. The sensor is faulty if the
resistance is 30 kΩ or higher.
●
Replace the temperature sensor if the resistance value is abnormal.
●
Check the temperature displayed on the front panel.
Possible Issues
PCB fault
If the error condition continues after checking these items, replace the PCB.
<Heat exchanger input temperature sensor / connector>
Test to confirm if the hot water temperature sensor is open. Error: MΩ open circuit.
Содержание NCB-700-2S+/42K
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