... . 5, economical and practical features: A, to save cold water of hot water pipe; B,Saving a lot of time to release ... : failure, fault code display good for fault diagnosis and repair...How to work ?1. Function key :3a) Press "ON / OFF", said ... ) Press " " button and the " " button, set the appropriate water temperature (system hot water temperature is 40 °C, Can choose between 25-75 °C ...