Reasons:
① No power access
② Thermostat is disconnected(exceeding the disconnection temperature point 1: 60°C±3°C)
③ Thermostat is disconnected(exceeding the disconnection temperature point 2: 85°C±5°C)
④ PCB failure
Solutions:
① Check whether the unit has normal power access
② When the water temperature drops below the reset temperature point (45°C±4°C), it can return to normal working state
③ Manually reset the thermostator
④ Replace the PCB