Check method
Defective safety
device
overheat
Check if the contact point of the overheat controller is defective.
Use a multi-meter to see if the resistance is normal (0.3Ω) or abnormal (∞).
Overheat controller
Check if the overheat controller wire is disconnected ( Normal resistance : 0.3Ω )
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.
Other potential
issues
Capacity setting
1.
If the Max switch #1 of 1-1 is on,
Set the switch to the normal operation position.
2.
PCB DIP S/W capacity setting error can suddenly increase the hot water temperature.
exchanger
The surface temperature rises due to heavy scale deposits in the primary heat exchanger.
Flush the primary heat exchanger.
If the issue continues despite checking the items above, the PCB is defective.
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