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Rinnai tankless does not fire on low flow

JPJohnson
JPJohnson Member Posts: 4
in Plumbing

When the hot water in the bathroom sink is turned on, my Rinnai tankless does not heat the water. Also, when someone is showering, the hot water has to be turned all the way up for the water to get hot enough. If someone turns on the hot water in bathroom sink while someone is showering, the water gets scalding hot.

Comments

  • bjohnhy
    bjohnhy Member Posts: 32

    How long has this been going on?

    This could be related to a crossover in your system.

    Do you by chance have a crossover valve under that bathroom sink that has failed (stuck open)?

  • bjohnhy
    bjohnhy Member Posts: 32

    https://www.prostarmechanical.com/blog/plumbingcrossover

  • JPJohnson
    JPJohnson Member Posts: 4
    edited December 16

    @bjohnhy , this issue started a couple of months ago. I will check for crossover. Thank you

  • JPJohnson
    JPJohnson Member Posts: 4

    @bjohnhy , I want to THANK you for your help here. I was able to find the crossover in my water system and fix the issue! Thank you again! I hope you have a Merry Christmas

  • bjohnhy
    bjohnhy Member Posts: 32

    Merry Christmas!

    I have personally had a similar issue. What was it and how'd you fix it you don't mind sharing?

  • JPJohnson
    JPJohnson Member Posts: 4

    It was my circulation line. So I just capped it at both ends

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