I hope this will help those searching the web for this error message which doesn’t, at time of writing, appear in any online documentation.
Having had an engineer out this week for my new oven, he confirmed only basic errors are published with explanations online. Not helpful!
Error F113 is a logic board error with the oscillator, according to the engineer. The solution is a “software update” delivered by replacing the logic board. So if you get this error, you will need a service engineer to help. Sorry!
Jason Kitcat 