Hum From Cistern When Flushing


M

Michael D

A month or so ago I started to get a noise when flushing the
downstairs loo. It’s a loud-ish hum that starts when the cistern is
about half empty and lasts for about 5 – 10 seconds. The hum stops if
I turn on the cold water tap on the sink. (I’m pretty sure both are
fed off the mains.) The pipe inlet to the cistern also vibrates
slightly while the noise is happening. When the cistern’s empty I can
make the noise happen for a few secs by lowering the ball cock to
about half way.

I’ve taken the top off the cistern and can’t see anything obviously
wrong. The cistern is probably about 10 years old. Any ideas?

Michael
 
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B

BruceB

A month or so ago I started to get a noise when flushing the
downstairs loo. It’s a loud-ish hum that starts when the cistern is
about half empty and lasts for about 5 – 10 seconds. The hum stops if
I turn on the cold water tap on the sink. (I’m pretty sure both are
fed off the mains.) The pipe inlet to the cistern also vibrates
slightly while the noise is happening. When the cistern’s empty I can
make the noise happen for a few secs by lowering the ball cock to
about half way.

I’ve taken the top off the cistern and can’t see anything obviously
wrong. The cistern is probably about 10 years old. Any ideas?

Michael


My mother's was doing exactly that a couple of weeks ago when I visited. I
dismantled the filling valve, cleaned the debris out and the symptoms
disappeared.
Regards
Bruce
 
T

The Medway Handyman

BruceB said:
A month or so ago I started to get a noise when flushing the
downstairs loo. It’s a loud-ish hum that starts when the cistern is
about half empty and lasts for about 5 – 10 seconds. The hum stops if
I turn on the cold water tap on the sink. (I’m pretty sure both are
fed off the mains.) The pipe inlet to the cistern also vibrates
slightly while the noise is happening. When the cistern’s empty I can
make the noise happen for a few secs by lowering the ball cock to
about half way.

I’ve taken the top off the cistern and can’t see anything obviously
wrong. The cistern is probably about 10 years old. Any ideas?

Michael


My mother's was doing exactly that a couple of weeks ago when I
visited. I dismantled the filling valve, cleaned the debris out and
the symptoms disappeared.
If that doesn't work, fit a flexible in the supply pipework - that sorted
mine out.
 
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M

Michael D

My mother's was doing exactly that a couple of weeks ago when I visited.  I
dismantled the filling valve, cleaned the debris out and the symptoms
disappeared.
Regards
Bruce
I had a go at cleaning it out, but it didn't really work as I couldn't
get it back on properly. So I bought a new inlet valve & ballcock and
the hum went straight away.

Michael
 

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