Pressures switch
Pressure switch
1: Igniter broken,(need a replacement) 2: pressure switch not make after blower started up. this is a protection, blower blows away any Gas that may "leak" into the heat exchanger, it is called "Pruge " The pressure switch is to confirm the fan has had ran,then the Igniter can be turn on (Red) and gas valve can turn on after. if you know where the pressure switch located. tap on it slightly it may work. or the pressure switch may also need to replace. if you like open up the cover, take a picture. I can show you where the pressure switch is in u r machine. good luck!!! as you already know the 鼓风机, there is a rubber tubing connected to a "round" it may be black or silver in colour device and have two wires connect to it. that is the Pressure switch.