hi i have a fisher and paykel 920 dishwasher it displays an f1 & u1 error?

mark,

I found this on another fix it site. I followed the process and it worked fine. I had two problems - a mouse had fried itself on the control box and may have caused a short circuit, and a toothpick was in the drain pan lodged upright. Not sure which one caused the problem, but the machine is working once again.

Here's the correct answer for our Nautilus 1 door two tray dishwasher:
The F1 display and continuous beeping means that the flood switch is activated. It
could be activated because of water (just being damp won't do it). Or it could be
activated because a naughty mouse built its nest underneath the piece of coolite
foam that activates the switch (which is what happened to us).
1) Unplug the dishwasher from the power point
2) Remove the cover plate under the door - there's a vertical screw on each side
hidden from view. Don't remove the centre screw as it's just connected to anearthwire lug.
3) Remove the earth wires from the two lugs
4) Remove the second plate by lifting it up and pulling forwards. It's got the wiring
diagram on the inside.
5a) The flood switch is on the bottom of dishwasher, with black and yellow wires
attached.
6a) If the bottom of the dishwasher has water in it, locate the plumbing problem and
fix it, then dry it out.
6b) If there's junk wedged under/around the switch or float foam, then remove it all.
6c) If you know how, you can remove the switch and test that it works with a
multimeter.
7) Plug the dishwasher back in temporarily, and check that it just beeps once like it's
supposed to. Then unplug it again.
8) Replace the first cover. Reattach the two earth wires. Replace the second cover.
9) Plug in the dishwasher, fill it up with the dirty dishes and wash them.

Mike
March 2010