Laguna ii A/C Unit stays lit up constantly?

Hi there, ive read through some of the articles on the forum but all i found was if there was a problem with no light atall, my problem is the other way around, as soon as i put the key card in, the heater screen illuminates even though the heater is turned off, ive tried turning the lights on but it doesnt dim or anything, i did the 101 re solder and hasnt done anything, im new to the laguna so any help would be great as i cant see the backlight constantly on been normal?



Thanks again :)