What are the fault phenomena of Viessmann wall-hung boiler fans? Data from: Beijing Viessmann Wall-Hung Boiler Repair Phone http://blog.tianya.cn/blogger/blog_main.asp?BlogID=3778856.
(1) Excessive fan vibration can be strongly felt at the rotor or bearing, and the vibration measured by a vibration meter has exceeded the normal value; sometimes there are impacts and abnormal sounds; sometimes there will also be phenomena of the rotor colliding with the casing or the fan shaft colliding with the casing seal.
(2) High bearing temperature - when touching the bearing cover by hand, it feels hotter than usual, as if burning; the bearing temperature exceeds the normal allowable value. Beijing Viessmann Wall-Hung Boiler Repair Phone.