Troubleshooting 89
Check method
Fault Possible Causes Check method
Defective safety device
Defective overheat
controller
Check if the contact point of the overheat controller is defective.
●
Use a multimeter to see if the resistance is normal (0.3) or abnormal (∞).
Overheat controller Check if the overheat controller wire is
disconnected ( Normal 0.3 )
Temperature sensor
error
Defective hot water
output temperature
sensor
1. If the hot water temperature is sensed lower than it actually is due to a defective
sensor, check if the deviation of temperature is large due to a defective
temperature sensor.
●
Check the output temperature displayed on the front panel.
2. Measure the temperature sensor resistance, and determine if the sensor is
defective.
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