The cooker stays warm when mains cooker switch is on.

contact someone that repairs them and ask them,look on ebay for one of the boards and you will find an ad for repair,they sell their services on ebay,this is an example,but,you might find your board or repair here, 0 results found for stove main board repair

Just allow them to dry completely after 3 days in a dry environment. If they continue to click, then call a tech to check the electrical

Take the tiny screws of there are loads down right hand side then release screws on hob once you can lift hob plates up. Undo the covers on back of timer clock control . Make sure you un plug from mains . Take the neutral of back of timer clock. This will allow your oven to auto ignite again

IF ELECTRICAL APPLIANCE
1. Check the fuse in your mains electric box, something may have triggered it to shut off, If off, switch on, if it doesn't stay on, you may have water/moisture in the electrtics (wait a few days, see if it has evaporated, try to switch on again).
2. Most electric ovens have a seperate fuse/switch in the kitchen normally at counter level, check to see switch is on, and fuse is working, sometimes indicated by a red light. You may need to change the fuse in the wall - MAKE SURE THE MAINS ELECTRIC IS TURNED OFF BEFORE DOING SO, BEST TO CONSULT A QUALIFIED ELECTRICIAN.
3. If using a smaller electric oven, i.e. a baby belling, it may come with a plug to connect to the mains, check the fuse.
4. Check for signs of damage in the cable leading to the mains, Best to turn the mains switch off for the cooker before doing so.

IF gas check you have a supply of gas running to the cooker, i.e. at the gas meter/pipe feed if on.

IF none of these work contact your gas / electic supplier for further advice, as dealing with mains electric / gas supplies can be very dangerous.

Hi yes it could be that if it only just done this leave it off you can still use the top the heat while cooking should dry it out.

Some have a AAA battery under the button - replace this, others use mains to create the spark, ensure you have the ignition wired up

Replace the oven thermocouple.

The knob won't have any effect on the flame size.  The knob controls temperature.  If you're referring to the pilot light staying on and then the main flame not going on...that's another problem.  If the main flame will not go on, the assembly that controls the main flame is likely defective.  If the unit has a thermocouple, you might change it out first.  Sometimes, that's all that is needed and they're cheap.

problem with hob is probably water ingress in area of ignition unit - will probably cure itself oven is a completely separate unit from hob. problem with it is that you have to re-set the clock - you have it on automatic. after power outage, oven clock always has to be reset