HomeForumsDaikinFault CodesDaikin U3 Error Code This topic is empty. Viewing 1 post (of 1 total) Author Posts July 7, 2024 at 2:37 pm #1177 TheAChubKeymaster Premium Check Operation is not Executed Error Code U3 Applicable Models REYQ-T Method of Error Detection Check operation is executed or not executed Error Decision Conditions Error is decided when the unit starts operation without check operation. Supposed Causes Check operation is not executed. Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In