De-Dietrich Fault Code needed Urgently! Home › Forums › Trade Technical & Spare Parts Forums › Trade Technical Enquiries › De-Dietrich Fault Code needed Urgently! This topic has 2 replies, 2 voices, and was last updated 20 years, 1 month ago by VillageIdiot2. Viewing 3 posts - 1 through 3 (of 3 total) Author Posts February 21, 2006 at 5:35 pm #15799 VillageIdiot2Blocked I have an FM4448E21 cutting out and giving me ER3 on the display. Have had a look through the ‘known fault codes’ topic and there isn’t any there for this. Any ideas what ER3 is? Any help……………is much appreciated. February 24, 2006 at 6:18 pm #166381 ttcchhParticipant Re: De-Dietrich Fault Code needed Urgently! ER3 means that the temperature probe is being read as open or short circuit by the PCB. Hope it helps February 25, 2006 at 1:55 pm #166382 VillageIdiot2Blocked Re: De-Dietrich Fault Code needed Urgently! Thanks mate, will see. Author Posts Viewing 3 posts - 1 through 3 (of 3 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In