Strange problems here...
First, I noticed that if I ran a sink then shut it off, the toilet in
the same room would immediately run. I recently had all of the
toilets (3) in the house replaced so I called the plumber who
installed them and he sent a guy out. He took off the tank lid, ran
and shut off the sink, and noticed that the tank water would ripple a
little and the float would bob - causing the toilet to run for a few
seconds. After poking around a little, he noticed that the water
shutoff valve for the toilet wasn't working and blamed the problem on
that. That made sense when he said it but doesn't really make sense
to me now.
Second, a new refrigerator with a water line has been making an
intermittant rattling sound. We finally discovered that if we run the
kitchen sink then shut it off the fridge makes a small rattle. If we
flush the problematic toilet, after it fills there is a pretty severe
rattle in the fridge. We're guessing the water line tubing (flexible
type) is being jerked around due to some pressure issue.
- Flushing a different toilet in the house has no effect on the
- I bought this house in January and all of the toilets had problems
and they were all replaced. The problematic toilet was a major job -
something about the toilet plumbing being off-set and out of spec.
The floor had to be dug up and the new toilet positioned correctly.
- This house also had a cracked foundation and was sinking about 1.5".
After the foundation was corrected with piers the plumbing passed a
static pressure test.
That's about all I know. I'm especially concerned with potential
backflow problems but any comments or insights about any of this
My guess is the supply/water lines in your home are marginal. Not to
say defective, but marginal. You did not say what kind of supply you have
(well vs. city) but if it is well, you may need a pressure tank, or you may
need to dry out the one you have. These things just amplify the normal
small increase in pressure that occurs when you turn off any water. The
water has been traveling down the pipe and when it no longer has anywhere to
go it causes a momentary increase in pressure.
That increase in pressure can cause the type of valve in a toilet to run
a little and also can cause any supply line not properly secured to move a
little. It is much the same as water hammer which can cause a bang when
you turn off the water.
If this is only one sink that causes the problem, it may be just water
hammer and you may need some arresters to stop it or the ones you have may
be the older type and need to be drained. You can try this by shutting off
the water supply and then opening all the supplies in the home, especially
the low ones. (turn off the water heater first to prevent any possible
Change the ballcock (fill valve) in the offending toilet. Maybe even
use a different brand. Changes in water pressure (such as by closing
a faucet) should have zero effect on the toilet.
This toilet may also be responsible for the resonance which is
occurring at the frig line.
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