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Fisher Paykel MW051 drain pump is always on?

When I power on the machine, the drain pump is always on. It drains the water faster than it can fill, so I effectively cannot use the machine.

The last fault code was #37. The pump isn't blocked; the pressure tube is clear; and the pump resistance is ok.

Any ideas on what is causing the drain pump motor to always be on, and how to fix?
James Glen, January 2010
Why would pump be on? - Because it has power going to it.
What supplies the power? - The control module.
Why would power be supplied by the controller permanently? - Because it is faulty. Replace the controller.

Lincoln Appliance NZ, January 2010
link Click here to see other fixes for Fisher Paykel MW051.