Krusty wrote:
Sounds like maybe it is still bypassed?
That.... Is known as SUSPECT #1
Suspect #2 is a check valve.. Many water heaters have a check valve on the outlet.. absolutly required if you have the single valve bypass.
This can crud up and refuse to open.. Causing the same thing to happen.
But I'm going with Suspect #1 since you had it winterized.
I always did it myself.
Three ways to winterize
Wet method. Fill lines with Pink stuff and have fun flushing it out come spring (yuck)
Dry Method.. Fill lines with AIR, if it freezes you won't be worried about your RV (blow at least 10 times to insure you get nearly all the water out.. Read file in library to do it right)
And the best method.. The S method.
Strap a snow blower on the front of tee rig.. Turn so compass points toward the eqator (most folks reading this that will be South, hence the name S method) and when you stop for fuel and someone looks at the snow blower, scratches his head and says "What the !!!! is that for" you are winterized.