Just had the same problem on mine. I don't know for sure yet but I've taken the temperature probe out and it seems to be open-circuit. I turned the oven on with the temperature probe disconnected and got the same error. I would try replacing it but De Dietrich inform me the part is obsolete, so I guess so is my oven :-o
Spence
December 2012
I can answer this question...
De Dietrich F 4827 has ER1 error message - what is that?
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