I went away for a three day weekend and left my heating unit plugged into the wall but didn't leave the heat running. I turned the modes off so it would only stay lit. I came back from my weekend to find that the power light is a steady yellow and will do nothing. The digital readout screen won't turn on and pushing any of the buttons doesn't help. I tried to reset it by leaving it overnight and even plugged it into a different outlet but its still the same. I've never had this issue before. I've left it on with no mode setting previously. Do I have to buy a new one?

Heating & Cooling - Holmes Products - BH3955-U Bionaire Utility Heater