I was wondering if anyone could help me, I have a 4yr old Rheem Criterion II furnace and lately we will wake up in the morning with no heat. The light codes are a follows the green ok light flashes 4 times in a row before the pause and the power light is steady green. Once we open the panel and mess with the thermostat it will start up and run fine for about a week or two before we have the same problem. Can't find any info about the different codes, and the inside panel on the door is in another language. Can you help???? Thanks so much.