Dishwasher drain problem

I installed a dishwaser (ASKO) in a remodel. The new cabinet is 6" higher (under a breakfast bar 42") than the adjoining sink cabinet (36"). This is great for saving the ol' back when loading and unloading, BUT I now get an F2 fault. Called Asko and they said the fault means I do not have the DW discharge at least 20" above the DW base per their installation instructions. I had joined the discharge tube to the inlet on the disposer under the sink, and true enough it is only about 18" above the base of the DW. I have checked around and at the local appliance store all the installation manuals for several different brands all called for 20" min between base of DW and dischage into disposal or sink tailpiece. (Except - Kitchen Aid which had the diagram backwards - 20" from the top of the DW. Wonder who wrote their manual?) I understand this is an antisiphon issue that must be the same for all mfgs. for code????
Can I install a horiz. Y where the 1-1/2" drain comes into the sink cabinet - go to my sink P-trap on one side of the Y, then add a second P-trap on the other side of the Y, and then a vertical pipe with a 1-1/2" tailpiece with a DW extension higher than the 20" min.. Then, do I cap that with a solid glued leakproof cap, OR a burp valve type cap (like in a motorhome). I figure I can put this in the sink cabinet behind or alongside the sink, and get plenty of height. The DW drain hose is high looped to the very top of the DW, and then thru a hole between cabinets to the disposal.
What will work and what is legal???

Try looping the drain hose up against the bottom of the countertop then down to the disposer. See if that gets rid of the error code.

Or, put in an air gap.

The 20" requirement is just to make sure you loop that drain hose tightly under the counertop so that if your kit. drain backs up it will not be able to backflow into your DW.
Do they have some sort of pressure switch to tell you missed the install on the drain hose by ONLY 2".

went through all the diagnostics with ASKO and everything checked out OK- I disconnected the hose from the disposal and held it high and let it run in a 5 gal pail. Still get the F2 fault. So thought about it for a few days - and in the mean time I'm thinking this is a float or sensor problem so I poured 2 cups of vinegar in the sump aand let it sit for a few days. Fired it up on rince and hold and it worked OK with/out F2 fault. (I had been doing all my testing before with the rince and hold cycle since it took only 3 min. and always got the F2 fault) So, tried a full load of dishes, and it made it through the first cycle, but then got the fault again.

This DW is 8 Y/o and have decided to junk it and get a new one. Hate getting rid of it but just don't want to deal with it anymore, and ASKO has a terrible repair history sooooo. Thanks for the help.

mbraet said:

I poured 2 cups of vinegar in the sump aand let it sit for a few days.

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Maybe you should add a little olive oil.

ASKO has a terrible repair history

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Combined with the age, reason enough to trash it. The new ones are more efficient, quieter, and do a better job all around. Consumer Reports did a full review in August '07; rated 2 Kenmores ($650, $580) as Best Buys, but a $1600 Asko came in 3rd. Kenmore ranked well in the repair history chart; Asko was 2nd worst.

I have an ASKO dishwasher. It's at least five years old and maybe older. I have never had a bit of trouble with it.

I also have an ASKO laundry set that is eight years old. Never had a problem with them until a few weeks ago when the washer would blow its internal fuses. I found the problem to be the radio interference filter and replaced that for $30. Add the $12. for a pack of fuses and this is the cheapest (and best) laundry equipment I have ever owned.

I wonder if the bad rep for ASKO is because those that don't have problems never speak up?