Question about CDA Dishwashers
Hello My CDA CW448 has developed a fault. When a wash cycle is started, it drains any water away ok, then runs for a minute or two, then stops, I can hear a small clunk when it stops. If it's left in this state, you can hear it trying to heat up water, but it isn't pumping any water around. It will eventually fill up with steam, but it never gets going as such. I don't get any warning lights, just the normal lights. I've tried resetting it, but no difference. I've pulled the unit out, turned it onto it's back, and checked in the bottom sump pan, there's no water in there, and everything is super clean. The polystyrene float all seems fine. If I then put the unit upright, and back into place, switch it back on, it will then actually do a wash which took me by surprise ... but never stops! I then can't do another wash. Any help appreciated :o)
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Posted on Jan 02, 2017
SOURCE: Drain pump runs continuously
Which model do you have and is there any fault codes showing on unit? I have all of the service manuels for miele products.I am factory auth. for service on miele.
Posted on Feb 24, 2008
the larger motor housing underneath the unit is what moves the water around to wash, the smaller pump is the drain pump, if you don't hear that running it is likely in need of replacement. check your paper work for warranty, if it's out of warranty try to find a deal online and it's relatively easy to replace
Posted on Mar 21, 2008
Sounds like an overfill problem - the symptoms are consistent with a failed pressure switch. Water enters the dishwasher through a chamber which has a float arm connected to a small microswitch -this is the pressure switch. The concept is similar to that of the float switch for the aqua-stop system.
As the water level in the dishwasher rises, the water level rises in this chamber. Once the dishwasher and the chamber are full, water pressure trips this switch, closing the water inlet valve and the wash cycle then starts.
If the pressure switch doesn't trip, the water level continues to rise and this trips the overfill float switch. This closes the water inlet valve and starts the drain pump. Once the water level has dropped the dishwasher attempts to fill again, but the pressure switch remains closed and the cycle repeats - ad infinitum.
To check the pressure switch you will need the remove the left side panel (when facing the door) and a multi-meter to test the switch with. If you have the necessary equipment and skills to attempt this repair yourself (seems like you do) please let me know and I will provide the relevant details.
Posted on Feb 23, 2011
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