Question about Bosch Dishwasher Timer Control Unit 092190
A few possible reasons why this happens:
1. The mechanism (usually a plastic shaft) has dirt on it causing a contact to not close properly.
2. An electrical contact is worn and no longer makes reliable contact.
3. Dirt on or in a contact causing it to not close properly.
Spares for any old machine is always a problem, and considering the complexity of the rotary switch mechanism, I'm extremely hesitant to suggest the methodologies required for fault-finding, and repair, since a custom repair requires tools that many simply don't have at their disposal.
Suffice it to say that (at least) you need a multimeter, and a thin insulated shaft for contact activation to get started. You would have to manually rotate the knob, and see which contacts are closing, and measure them (at the points where the wires connect - NOT on the contact themselves) to determine if they are indeed making contact. The insulated shaft is used as a probe, to lightly move suspect contacts into the closed position, and confirm where the problem lies.
If a contact seems to close, but does not make contact, then check aforesaid contact for wear and dirt. Check the lobe on the plastic cam for dirt build-up which will also cause the contact to not close properly
Oh yes, don't forget to unplug the unit from the mains before proceeding.
All things considered, it might be prudent to retire the machine.
Posted on Jun 07, 2011
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Posted on Jan 02, 2017
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