Is the heat pump water heater equipped with leakage protection plug?
Brown, blue, green and yellow lines are fire, and ground zero, and a black line is not leakage protection (real leakage protection only need to fire, zero line, ground wire is grounding protection), but over temperature protection or insulation, the wire and wire (branch line) connected thermostat, when the temperature reaches the set temperature after the thermostat is switched off, the power cut, stop heating.General like this with temperature control function of the leakage protection plug on the market is relatively rare, only the original, suggest you look for the brand of electric water heater manufacturers repair replacement, if leakage protective plug, which is not connected with the black line, is not up to the high temperature and heat insulation effect, only hot water after burning immediately. Take a shower.
General manufacturers are configured leakage protection plug, but leakage protection plug their configuration will not burn out easily, suggest you buy a leakage protection plug is good, a few days ago in the Tmall Island flagship store bought two plugs, now good, feel good
It seems that there is no match, only a cable, one machine may be there!
