Found unit off. Took side panel off, found all hose clamps very loose. Tightened all and powered up unit, hose got very hot and the relief valve blew off. Will obtain and replace relief valve. Obtained info from factory on deliming and cleaning. 2-23-17 replaced relief valve, ran, found a few leaks and a burnt relay, stuck closed, causing it to run the burner at all times. Got relay unstuck, unit is working, but main leak in rear at the top connection on super heater. Will need new super heater, relay and timer. Will submit quote for repair.