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My suggestion was not meant to be a permanent one, more of a test to see if swapping out the check valve will be likely to fix the problem. Also, even though you can/will end up with "cold water sandwich" behavior in this mode, at least your shower will be hot while you wait for your replacement...

So I replaced the check valve and everything is working great now. Super easy fix, took about 15 minutes total and that was with explaining to my kid what I was doing. In terms of diagnosing the problem, I thought I'd leave this here for others in case my explanation is helpful. To figure out...

Thank you for your reply. Earlier today I ordered 1 flow sensor and 2 check valves. They’ll show up tomorrow. I’ll try to replace the check valve first and hopefully that will do the trick. Then I’ll have the other items in reserve. I hope it works!

I'm trying to diagnose what is going on with my Navien 240A hot water heater running on natural gas. We've had it for about 6 years, and it's worked fine up until now. It gets descaled each year with vinegar and the filters get cleaned (air and cold water intake). Yesterday my family complained...