... we need to use hot water ,it will work ,it won’t waste any energy.6, leakage protection function: When the system has ... , fault code display good for fault diagnosis and repair. How to work ?1. Function key :3a) Press "ON / OFF", said circuit ... continue to work, flow switches off, the circulating pump to stop working. c) Press " " button and the " " button, set the appropriate water temperature (system ...