I see my original msg may have been ambiguous. What I have is a
temperature problem that I believe is caused by low pressure. I mean
to say that the cold pressure is normal while the hot pressure is low
and thus the low hot pressure is causing a temperature problem.
Check by removing Delta cartridge (all water shut off to house). Obstruction
may be lodged in the cartridge. If not, you may have to have someone hold a
towel over the opening while you turn the water back on briefly to flush the
debris out of the line. Failing that, I have seen 1/2" copper caps lodged
inside of 3/4 elbows and tees (installed in construction).
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