My son has a dead Bosch WVF 2401. Red light comes on but that's all. There was some sparking from underneath, I was told! I wonder if the TRIAC on a pcb does anything useful? It is a 12A TO-220 device.
I'm sure I can easily repair it with the circuit info.
Thanks in advance.

Al, December 2009

Hi Peccavi,
Thanks for a speedy response. It is very useful to know the TRIAC is a motor driver. I thought it could have been in series with the neutral supply to the whole electrical control system. It is hard to trace the wiring as they used the same colour quite at lot!
I would have thought the water inlet solenoids should be energised and or pump when the machine is started. Maybe it is simple like the door switch!
Al

Al, December 2009

The Triac is the final drive to the Motor - all components on the PCB do something useful else they wouldn't bother including them. A new triac will cost about £2 perhaps and will need heat sink compound between it and the heat sink for thermal conductivity.

You will be extremely unlikely to "find" a schematic - the manufacturers will not wish casual repairs by users and the resulting litigation from cases of electrocution - they will probably restrict access to drawing sets to approved service agents.

You should not need a schematic to replace a triac - just the component and a soldering iron etc.

The sparking from underneath will probably not be caused by the triac which will either work or will not work and will hardly ever (never) give off sparks - I would suspect brush failure in the motor (£) or the motor itself (££££).

Good luck...

Peccavi, December 2009