Gas Control Valve Troubleshooting

A water heater gas valve controls the pilot light, water temperature and it has a
safety limit to shut everything down.To check the pilot control of gas patio heaters , follow the lighting instruction on the water heater. Do not try to light the pilot if you smell gas.Press the pilot button down and light the pilot.If the pilot lit but will not stay lit when the pilot button of gas safety burner valve is released the water heater thermocouple could be the problem.If the thermocouple has been replaced and it has been properly installed (tip of the probe in pilot flame, thermocouple screwed in tight at the control valve,thermocouple line not kinked) and still the pilot will not stay lit when you release the pilot button then the gas control valve is at fault.If the pilot will not light at all with the pilot button down check the gas supply.You have gas and the pilot still will not light, the pilot line or orifice may be clogged.