Originally Posted by kdavies
I just de-winterized my Rockwood (winterized by dealer) and I am trying to test all systems. Filled the tank with water and have water coming from both hot and cold faucets. When I turn on the water heater it fires up but then turns off and is not heating the water. I hit the Reset buttons and waited overnight to test again - same issue. The pressure valve also has not pressure after this. Help! This should not be so difficult. Not sure if there is something the dealer did when it was winterized that I am missing.
First rule of Water heaters-NEVER turn on electric element or gas burner until you prove heater is full and water comes from opened relief valve.
Sounds as though dealer correctly closed inlet and outlet of water heater supply lines for winterization. He should have then drained the heater for winter. Your gas heater may have been going out on high temp trip.
Locate heater outside then direct opposite on inside will be the plumbing on the back side. You only need to close the "bypass valve" and open the inlet/outlet valves. Apply water pressure again and wait till water gurgles from hand lifted relief valve, on outside of heater. Then you can add heat.