One wire on igniter measured low resistance to ground with oven power disconnected meaning gas safety valve probably OK. Turned oven on & carefully measured 120 volts to ground from other wire on igniter meaning circuit board & controls OK. Disconnected igniter had infinite resistance condemning it. Replaced igniter & everything works. Telephone conversation with Appliance Parts Pros gave me several pointers & greatly increased confidence. The new part arrived in several days, the price was good. Very satisfied & would order again. Thank you.