Winterizing 2004 Sightseer

[r4etired]

I followed the manual on installing the RV antifreeze in the water system. The water heater filled also. Is there a method to stop the heater from filling so it don't take so much antifreeze. I closed the water htr bypass valve but it didn't keep the heater from filling

[r4etired]

I followed the manual on installing the RV antifreeze in the water system. The water heater filled also. Is there a method to stop the heater from filling so it don't take so much antifreeze. I closed the water htr bypass valve but it didn't keep the heater from filling

[JerryForwood]

You must not have set the bypass valve correctly. The purpose of the bypass is to bypass the water heater thus taking it out of the circuit. Set properly, you have use of the water system with the water heater being out of the circuit. You then drain the water heater and do not need to put any antifreeze in it.

[AFChap]

Wecome to the list!! My '03 Ultimate Advantage had an electrical bypass valve that acted like it worked, but didn't. It was replaced under warranty but still had the same problem. Finally, after replacing the second electric valve with a manual bypass we found there was a back-flow preventer valve in the plumbing near the WH that had been improperly stalled and could not close.

[troth]

r4etired,
At least one of your "automatic" check valves automatically failed... And it let the pink fill up your water heater. My advice is to get rid of the pesky check valves, replace them with good 'ol positive-action, quarter turn brass bypass valves.
Click on the magnifier glass above & do a advanced search for "water heater bypass" or "check valves", especially in the Winnebago forum.