I purchased this refrigerator used , when i got it home i plugged it in it seemed to work fine, the control panel seemed to work ok. I decided to clean the inside,it had been plugged in for a couple of hours and seemed to cool the upper and lower section fine the water dispenser worked ok,while cleaning i noticed the lights went off so i closed the doors and the lights came back on. After cleaning i noticed the message on the control panel ER IF, I tried to get information on line but couldn't find a trouble shooting section for this problem, I didn't get an operating manual with the unit but was able to get some information from a web site.If I unplug the unit it seems to clear the er message but after a few minutes it comes back. Any suggestions would be helpful. Thanks in advance Sam