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EMD360's avatar
EMD360
Explorer
Aug 13, 2015

Always Something--Hot water clog UPDATE

About mid trip, at a campsite with a direct water hookup, our hot water lost pressure. I'm pretty sure it is clogged at the one way spring valve on the water heater. I already bought two new ones because they were making a strange noise a couple of years ago now but that seemed to just stop so I never installed them.

Maybe when the water pressure increased during the direct hookup, the valve stuck closed. I tried popping the pressure relief valve to be sure water was running into the heater and tried shutting off the water with an open water spigot like the manual directs to recreate the air bubble at the top of the heater, but neither tactic worked.

I wanted to take it apart right then but we decided we could live without hot water for a couple of days until we returned to home base to work on it. The valves were expensive, I sure hope I know where I put them. Not in the RV of course so taking it apart would not have helped unless it was not the valve. On a shelf somewhere...:h

7 Replies

  • I just have to add that I hooked up the water, filled the hot water heater and tried the hot water taps and THEY DIDN'T WORK!
    I was trying to figure out what I did wrong, could I have a valve in backwards? So the in valve was working just fine, the water heater filled with water.
    I just let out part of the water with the pressure relief valve and then undid the top valve. A small piece of the broken valve had fallen into the water heater and when I refilled the heater, the piece got lodged in the upper valve! So I removed it and reconnected and finally the problem was fixed.
    Just thought it was another typical fix. If at first you don't succeed...
  • I found the new valves on ebay and they were listed by zorotools.com
    Here is the item I bought--SMC CHK BRS 810-8M8M-F, Piston Spring Check Valve,Brass,1/2"
    The total cost for the two valves was $41.32. I saved the shipping charge by adding another small item to my order. But they charged me shipping on both and I had to ask for a refund. They were super nice about it though and refunded both shipping charges.
  • I put the new spring check valves on the hot water heater today. I drained the water heater for the task. Thought I would post some pics.
    The new check valves have brass inserts--here is one compared to the broken plastic valve that was causing the trouble.

    One of the old check valves had the plastic gasket from the plastic plumbing connection stuck to it. I reused this gasket in the new connection.

    Here are both new valves installed. You can see the hot water shutoff on the bottom pipe in the background.

    Of course I ran out of time and did not refill the hot water tank to test these new valves yet. Hope there is not a problem.
  • Typical water heater issue that have check valve in hot outlet.

    They fail, get clogged etc.
    They are installed to stop water from flowing backwards into water heater when it is bypassed VS installing another shut off valve in hot line.

    Disconnect hot outlet then remove nipple (check valve) screwed into tank.
    Install one of your new ones...........

    OR go buy another 1/2" shut off valve and install it in the hot line. Then remove the internals on new check valve and screw the empty body (nipple) into tank and connect hot line back up

    No more check valve to mess up later on.
    A shut off valve to isolate WH when winterizing OR IF needing to work on it w/o water in it.
  • pnichols wrote:
    I don't winterize our motorhome - if that's what the one-way valve is for. My stick house doesn't have one in it's hot water system, so now the motorhome doesn't either.

    Here's the thread I started where I got great help with the problem:

    http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/28071985/gotomsg/28072716.cfm#28072716

    I is for winterizing/by passing the water heater. Our 06 uses the single valve system to by pass the water heater

    Ken
  • I had a hot water flow block many months ago. It was the white plastic diaphram from a failed one-way valve. I just took out the plastic diaphram clogging the hot water tank outlet and left it at that ... it was a real hassle to do it. I don't buy into any reason that I need a one-way valve there in the first place - it's just another thing to break when out in the middle of nowhere and maybe cut short or ruin an RV trip. I don't winterize our motorhome - if that's what the one-way valve is for. My stick house doesn't have one in it's hot water system, so now the motorhome doesn't either.

    Here's the thread I started where I got great help with the problem:

    http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/28071985/gotomsg/28072716.cfm#28072716
  • j-d's avatar
    j-d
    Explorer II
    One of these?

    Daughter's RV had a problem with one of those so I decided to buy a spare. It IS in our coach. Like you, I wonder where...