Richard, could you take a look at this ? I saw your post below about adjusting FSDL that didn't help in my case. This has been an issue since I got the unit (about a month ago). Temperature doesn't seem to be a factor here. Does it hot or cold. This doesn't impair the unit, everything works like normal. My concern is when the unit is out of warranty and something goes wrong.
Referencing post
http://www.aquamist.co.uk/vbulletin/...ead.php?t=2730