Water heater bypass valve on Silverado

I can't get the hot water heater to fill on my brand new Silverado 35RES. Any help would be greatly appreciated.

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Well-known member

Your Water Heater Bypass valve is likely in the Bypass mode. Look in your UDC for it. If not there, then it's behind the utility wall.


Well-known member
Hi CapnSteve59,

From the subject line, it sounds like you suspect the water heater has been bypassed for winterization and you don't know where the bypass valves are located.

On trailers that have a Universal Docking Bay (UDC), there's typically a bypass valve there. If no UDC, there are usually 3 valves on the inside, close to the water heater. I've attached a picture of how it looks on a Cyclone. Yours may be similar.

The open question is how to access. On some rigs, there's an access panel inside. On others, you have to take down the rear basement storage wall near the water heater. Usually the dealer shows you this during the PDI walk through, but sometimes things can get skipped.

Perhaps another Silverado owner will chime in with how it's accessed on theirs.


  • Cyclone Water Heater Bypass.jpg
    Cyclone Water Heater Bypass.jpg
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Well-known member
Pretty fast. Maybe 15 to 30 mins. In addition to the 110 VAC water heater switch indoors, be sure you turned on the little black rocker switch outside behind the water heater cover (if your's is Suburban). Note too that it's okay to run the propane burner at the same time for a quick heat-up or recovery.