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Member Since 19 Sep 2005
Offline Last Active Jul 05 2013 11:39 PM

Topics I've Started

Bosch Dishwasher SHU5305UC/U12 low/no circulation pump pressure

01 July 2013 - 12:34 PM

My Bosch Dishwasher SHU5305UC/U12 suddenly has no wash pressure from the circulation pump.  Just a trickle from the lower arms, with arms removed maybe 1-2" of head from the outlet tube on the floor of the dishwasher.


I was hoping to preemptively order some parts for this before doing the major exploritory dismantle, but I am a little stumped as to what is causing this based on the circumstantial evidence I have. Stuff I know so far:


• very little pressure/flow from the circulation system.

• Reached into circulation pump inlet and found no blockages

• put a socket on the circulation impeller and it turns freely.

• Circulation pump motor reads 10.8 ohms at the control board.

• Circulation pump motor is drawing 1-1.1 amps.

• water heater had been working in the past, not coming on now, but I assume that is from the circulation flow switch not activating do to low flow?

• Circulation pum seems to run fine under power, but the noise it makes is different from before.  I can't tell if this is pump cavitation do to a blockage, or something else.  The motor does turn freely with a socket and I couldn't feel any dragging, scraping, bad bearings etc.



My guesses at this point without dismantaling and actualy looking at the thing are: 


Missing/broken impeller vanes?

Some kind of blockage between the pump and the outlet.  Is it possible to have a blockage there, it seems like it is just the heater module and pretty wide open space.








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