If your oven has a digital display and the control panel doesn't light up, reset the house circuit breaker for the wall oven if it's tripped. If the oven has power but the control is dead, you may need to replace the electronic control board.
In an oven that uses dial controls, a tripped house circuit breaker or a failed oven control thermostat can be the problem when you find the wall oven not working at all. Reset the house circuit breaker for the wall oven if it's tripped. If the oven has power, you may need to replace the oven control thermostat.