1. Check Item2 (Induce Motor). If it works, go next; if it doesn’t work, order new one.
2. Check Item 13 (Gas Valve). Use a multimeter to measure the Resistance of the valve solenoid coil, the reading should be around 1kΩ. If so, go next; otherwise order new one.
3. Check Item9 (Flame Sensor). Lightly clean the surface with fine emery cloth (120 and up).
This is it!That should be a problem with pressure switch. http://bbs.comefromchina.com/forum43/thread1202297.html