After a lightning storm my bosch single 30" wall oven displayed an F03 err. I turned the power supply off at the breaker for one minute as directed by the oven's manual. This action did not solve the problem. Could the lightning have burned an electrical component out and what should I look for? Oven model no. HBL5035AUC/02 SN NO. FD8711 194237 Thanks, J.

An electrical storm, a power outage and other problems can cause a voltage surge to travel into homes and damage or destroy sensitive electronics.

Particularly at risk is the very sensitive CMOS chips used in computers of all sorts and these days almost everything has a computer inside..
These days a radio and a tv are more computer than anything and even the humble toaster contains a small computer.

It is unwise to use a computer without a surge protector to provide some protection against everyday surges, though even very expensive models can provide little protection against lightning induced surges. The best protection is perhaps derived from the herd effect - when over time a household has purchased a surge protector everytime a new appliance was brought into the house and in addition has installed an area surge protector the protection level increases greatly even for "unprotected" devices or appliances.
When the neighbours on the same phase also have a herd of surge protectors you are helping to protect each other.

It is also worth mentioning a surge doesn't always cause something to fail straight away but can cause a weakening effect on electronics so they might fail months or even years later (for no apparent reason)...

Find out what the F03 error is for and then check out the appropriate area. If there was a strike of surge the most likely place to look for damage is the area where the electricity first enters into the device.