Water Heater Relief Device

I had the same problem with my Suburban WH and no procedure worked to fix it. There is nothing wrong with your valve most likely, it is a design issue with the water heater IMO. Suburban knows it’s a problem, says so in their manual, and has no plans to correct this feature. I struggled with this issue for four years and finally took Suburbans work around their problem solution.The only solution is to install a small pressure tank inline with the water heater. The pressure created by the heating of the water is absorbed by the tank and not blown out the relief valve.

I never had this pressure relief issue with an Atwood in five other motorhomes.