Rut Roh....Water heater bypass valve kaput?
So went to winterize this afternoon and wouldn't ya know it, the water heater bypass valve wasn't bypassing cuz antifreeze was going into heater! UGH! Doing some research, it's one of those Thetford 9...
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Since you have the lines off an easy way to check for the check valve is to stick a screw driver in the top connection of the water heater. If it hits something solid the check valve is there. If you only have one valve the check valve needs to be there and be operating to winterize.
See this video Replace RV check valve
See this video Replace RV check valve
