The oven would not come on at all.

First i turned off the gas and unpluged the electric to the stove. I removed the gas line and the screws that held the housing of the hood and valve assembly .Then i unplug 4 wires that operated the safety valveon the gas.Unthreaded 2 lines ,one for the oven and the other one for the boiler.I then replace the new hood and valve kit and put everything back together and the oven works just fine.