Addressing this issue requires the help of a plumbing professional. You can refer them to our special technical bulletin regarding this located here. Need a local Pro for this service? Find one here.This is an integral feature on the ICON® gas valve system designed to assist the professional plumber with operation and troubleshooting. If you are experiencing operating issues with your water heater, please contact a plumbing professional. Want the technical documentation and manuals for your water heater? You can find them here.