Electric Oven - Mode Button not working

fozziebeartoo2

Totally non-diy older lady typing - please forgive me if I sound like an idiot!
When I moved into my bungalow, appliances were already here. Cheap as chips I am sure. Not recognised brands.
Electric oven is built in, UBOVFP60. No other identifying names.
The mode button is now very hard to use, it needs jiggling and lots of pushing to get the oven on. I imagine this will only get worse. It is just a very small round button. It doesn't click or anything. Previously I just pushed it and oven came right on.
In these desperate times, can I try a little spray of WD40? If I am very careful?
If this button finally refuses to work, I am ovenless!
I would appreciate any advice. Thank you.

Hasbeen

It looks like its a Culina brand oven built under. Would not try WD40. You can look on line for the instruction manual. Not sure if you are able to leave the mode button on and just use the oven on switch.

fozziebeartoo2

Hasbeen said:

It looks like its a Culina brand oven built under. Would not try WD40. You can look on line for the instruction manual. Not sure if you are able to leave the mode button on and just use the oven on switch.

Thank you very much for your reply. I have the manual and it seems that the oven goes into standby mode (after 5 hours) and then totally off automatically after 10 hours. To make it work again you press the mode button. No option to turn off the standby mode. 
In normal times I would get an engineer round but am in 12 week lock down.