... water heater 2.Punctual delivery 3.Short circuit protection PCBA Design for Heat Pump Water Heater 1. Auxiliary power function, multiple ... , and have corresponding erro code shows.2. Digital screen, display level, temperature, fault code, real time clock, timing time, memory of ... time, input water leavel, timing input water time.4. Water level detecton, AC/DC valve control input and make up water ...