... to learn the names and functions of each part before use.2,Install on the wall height of 2. ... connected. 2,Should be warmed-up for 3 miniutes before normal work. 3,It's normal when there ... the following conditions for the paid service 1,Error use, and the unauthorized modification or improper repair of ... failure. 4,Other failures and damage caused by improper use which do not mention on the manual . 5 ...