I have a 2006 Monoco. My water heater worked fine last year. I had it winterized and when I took it out and dewinterized, the water heater now won't stay lit. It ignites, I hear it heating , there is warm water but not hot. Then I check it and the dsi light is back on. I turn on all burners on the stove to bleed any air in lines, I run all hot water, still it won't stay lit.
Help