This is the main gas
control for this boiler From here on I
will refer to it as the "gas valve" Take
A good look at it, see the water stains,
This gas valve is dangerous. Any gas
valve that has been exposed to this much
water MUST BE REPLACED.
Ok Now we Have Dielectric unions to repair, A bad Thermocouple To replace, A bad gas valve to replace, and this boiler is dirty. So As Always First things first. Turn Off the Power And The Gas To This Boiler.