We fitted electric underfloor heating back in about April, and over the last couple of days i've noticed the LCD display is _very_ faint (possibly a bad connection ?!?) - but it seems OK when i've checked it overnight when it's normally in a sort of "top up" mode
Do LCDs tend to suffer if the ambient temperature is low ? - the controller is in an ante-room, which is basically a small square with a tumble dryer and a single glazed back door with a huge sodding dog flap to let the mutt out, so if ambient temp can be a problem for it, it might not be a "real" issue to worry about :-}