Domestic Appliance Forum

I have had a Cannon Traditional 60 dual fuel cooker for a few years now with no problems. Whilst cooking Easter Sunday lunch using both ovens and hob, both ovens stopped working (the hob still worked) and a code of F 04 kept flashing up.
I turned everything off for a few minutes and the time clock replaced the code. I turned everything on again and the ovens regained heat and worked as it should.
When everything was turned off again the code F04 flashed up again for a while.
What does this mean please?