At my parent's house, one shower has a handle that goes from hot to
cold. You have to put the handle at one certain position to get any
hot water, and then it isn't very much. If you move the handle just a
little bit in either direction, the water is cold. (The sink in the
same bathroom gets plenty of hot water.)
My mother asked the plumber who installed it and he said that the
reason is that it is a low-flow shower head. I think that the valve
is either installed incorrectly or messed up.
What do you think it is likely to be?
If it's "hot" in one position and cold on either side of that, yes, the valve
is screwed up. With some of these valves, the stops are in the handle. The
valve may be in the wrong position. Does it, by chance, operate backwards?
You might try pulling the handle and rotate the valve 180degrees and reinstall
Is it a temperature controlled anti-scald valve? If so, it has to be
adjusted to allow more hot to flow in the mix. Since it goes cold
again after the hot spot, it may be an adjustment or it could be a
First step it to get the model and see if there are instructions on
line. If they does not help, call the customer service of the
manufacturer. They usually offer good service and good warrant
I don't see how a low flow head would affect temperature. Get a new
plumber next time.
As far as you know: When was it installed ?
Take a picture of the valve in question, host
it somewhere on the internet and post a link
You are either not knowing what to look for
on the valve to describe it OR are being
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