Check method
Defective sensor
temperature sensor
Check if the temperature sensor is open and if the connector is connected properly.
Temperature sensor
Check the resistance of the temperature sensor. (Defective if it is 30kΩ or higher)
Replace the temperature sensor if the resistance value is abnormal.
(refer to page 62)
Check the temperature displayed on the front panel.
(refer to page 39)
Possible Issues
Defective PCB
If the issues continue despite checking the items above, replace the PCB.
<Heat exchanger input temperature sensor / connector>
Check if the hot water temperature sensor is open (Error type : MΩ Open)
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