The pilot light will not light - even when I remove the case and apply a lit match (which is the way I've had to do it in the past whenever it goes out, even though the piezo ignition is sparking).

Also, unlike previous occasions I can't even hear the faint hiss of the gas coming through the pilot when I turn the knob ready to ignite. Clearly no gas is coming through (I've checked the supply and it is on).

Is there a valve/control that could be at fault? Thank you.

Roger, November 2009

Pilot light will not light even though ignition is sparking. What can be the trouble. There is a gas supply I have checked gas appliances in kitchen which is where water heater is situated

Anne G, March 2016

clean out pilot jet, if pilot works but wont stay on renew the thermo coupling

malc the plumb, July 2010