Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

mixer valve on gas hot water heater?

When we turn on hot water taps, only cold water comes through. The water in the hot water tank is hot. Any other suggestions, other than the mixer valve. We recently went on vacation for 5 days and set the tank mode to 'on vacation' and then turned it back to regular setting when we returned, but can't figure how this could cause the problem we're having. Any suggestions?


  • princess53
    princess53 Member Posts: 2
    it is a Heatguard 110-D
  • hot_rod
    hot_rod Member Posts: 22,246
    The mixing valve may need to be delimed, the Cash Acme website may have info on how to service that valve.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • kcopp
    kcopp Member Posts: 4,438
    Sometimes those type of mixing valves get a bit "sleepy" and need to be woken up. Make a note of where it is now.
    Then crank it clockwise full and then counter clockwise. then return to where you had it. Usually that will get it to work properly again.
  • Zman
    Zman Member Posts: 7,572
    The mixing valve is certainly a likely culprit. The advise you are getting is correct.
    I would be looking for any kind of cross connect. A "Y" hose on a faucet or anything that changed in your plumbing system...
    "If you can't explain it simply, you don't understand it well enough"
    Albert Einstein
  • Larry Weingarten
    Larry Weingarten Member Posts: 3,323
    Hello: I might do this little test first: Run hot water from a tap and then go feel all three lines to the mixing valve. What you would like to find is the cold feed to the valve being at room temperature (along with hot water from the tank actually getting to the mixing valve) . If it goes cold, you know the valve is mixing in cold water and that's a problem to fix. Otherwise, it's elsewhere and we can help you pinpoint it B)

    Yours, Larry