Problem was intermittent. Range would run for a couple of days and had to be unplugged for a day or two and then may run for 2 hours or 2 days until unit went into error mode again. Followed service data shset and replaced ESEC-UIB ($125) . Range has been working now for 4 days and error code has not reoccurred. Remove side panels and then remove plastic front panel which has both Philips and Star screws.