A:AnswerThe error codes most likely to be displayed on the LG - 2.0 Cu. Ft. Full-Size Microwave - Stainless Steel, Model # LCRT2010ST are; F1, F2, F3, F4 and F5. We do not have anything showing for error code "H90". Please contact our Support Center at (800) 243-0000 for assistance with this issue...^IFV
A:AnswerI have the same problem and it's annoying. After 5 minutes of inactivity, the Display turns off to save energy. You have to touch any button to reactivate the display. This is the only microwave I have ever had where the Clock turns off.
A:AnswerNO, the attached supplement sheet that came with my microwave says there is no alternate to keep the clock display on all the time. I find it most annoying and probably wont buy this again just for this one small reason.
A:AnswerYou did not indicate if you meant the Manufacture Warantee or one from Best Buy. Regarding the Best Buy one - you'll have to ask them.
The manufacturer warantee can be found in the manual, which is here:
http://www.lg.com/us/support-product/lg-LCRT2010ST
A:AnswerI wish it could/would have that option, but based on the user manual, this is a "energy saving feature". Clock disappears after ~5min of inactivity.