AEG DOUBLE OVEN D5701-4-M E025 / E021 ERROR

Hi guy, went to the above oven which would not turn off once the main oven was turned on – turned out to be a welded closed relay on the control board. I replaced this relay and oven has been working fine for a couple of weeks but customer mailed today to say he now has the above error codes. Oven powers up but shuts down after a few minutes and displays one of the codes until turned off at the wall – see below –

“after being on for about an hour it turned
itself off and displayed the code – E025 on the display so i turned it off and left it to cool and the code changed to E021 and the oven would not turn on. we were away at the weekend, so i left it off to see if it reset itself. i have since tried it again and it turns on, but shuts off after a few minutes displaying either E025 or E021 and that code then stays on the display until it it shut off at the wall.”

Cant find and reference to these error codes – any ideas please ??

gadget