Set the minute minder to minute and wait until it starts beeping.
DO NOT turn off! Press the minus button to cycle through the different tones until i you hear the tone you want
Jim Benny
July 2022
Hey guys thanks for your Q & A. We have a Creda Europa S230G which developed the same quiet beeper. My wife said she'd messed up pushing some buttons, but couldn't remember exactly how. I switched it off and on, like you suggested and hey presto, back to loud beeping again.
Yorkydownsouth
December 2010
The only way I have found is to turn the cooker power off and on again and then the original loud volume is restored. It seems that pushing some combination of the buttons makes it go quiet but I haven't worked out exactly what the combination is.
John Lawrence
March 2009
I can answer this question...
Creda Aspire Solarplus cooker - how adjust beep volume?