E3. The common fault code of AMBOR liquid heater is E3, which means that the voltage is too high to give an alarm. If the city network voltage is normal, there are defects in the original parts such as voltage detection resistor, rectifier bridge and display board inside the machine. Founded in 200 1, AMB is a large-scale Hong Kong-funded enterprise integrating R&D, small household appliances production and sales. Its products cover health pots, coffee pots, humidifiers, rice cookers, toasters and many other household appliances.