Sorry to hear your still having trouble

... I've never had to send something back or RMA to AC so not entirely sure of the proccess. But there is this Support link
HERE , A bing tanslate of the first paragraph comes out as:
Aqua computer gives an implied
warranty of 24 months on all products. Before returning a
defective product, we ask you to contact us using the following form or
alternatively by E-Mail, fax or phone in knowledge. Often, we can help you so much more quickly and simply send such as
small parts. After the legally prescribed warranty period
we want to are further in partnership at the side. We
offer you therefore have the possibility to make an informal application of
grace to us.
We would like to point out at this
point once again, that for damage through the use of other refrigerant as double
protect Ultra or distilled water with ACfluid assumes no liability. All wear parts and consumables are excluded from the warranty as well,
of course.
When submitting an article, please
place a copy of the invoice or simply a piece of paper with the order number on
your invoice. Send the article to:
e.t.c e.t.c...
I would give this a shot & maybe someone can either advise what to try or to RMA the device if thats whats required..
N.