THE FLAME ON THE BURNER IGNITES BUT IT WILL NON INCREASE IN SIZE WHEN I TURN THE CONTROL KNOB TO A HIGHER NUMBER ON MY NEW WORLD VISION G90M COOKER-MODEL NUMBER - 200504055 I SUSPECT THE OVEN THERMOSTAT IS FAULTY BUT AM NOT 100% SURE AND THERE ARE OTHER QUITE EXPENSIVE PARTS, SOLONOIDS ETC.