Good Morning all,

I've just had a new combi boiler put in by those ever so nice British Gas
people, however we have one problem with it....

Whenever we flush the toilet it starts to fill up the cistern and when it
has finished there is an almighty bang (its more like a VOOMF than a BANG).

It is quite scary for our cats but its also annoying and worrying...

At the moment we have a mini float valve in the cistern, is that up to the
job? it is the original valve from when the house was built over 20 years
ago?

Can anyone suggest a solution to my problem please.

Regards

Dave

On Sat, 12 Jun 2004 09:05:58 +0100, "Big D"
wrote:

Good Morning all,

I've just had a new combi boiler put in by those ever so nice British Gas
people, however we have one problem with it....

There's your problem right there.


Whenever we flush the toilet it starts to fill up the cistern and when it
has finished there is an almighty bang (its more like a VOOMF than a BANG).

It is quite scary for our cats but its also annoying and worrying...

At the moment we have a mini float valve in the cistern, is that up to the
job? it is the original valve from when the house was built over 20 years
ago?

Can anyone suggest a solution to my problem please.


Absolutely. . Is the sound coming from the boiler or the cistern
or the pipework?

You've already paid a lot of money for BG to do this (their pricing is
generally top of the range), so they should fix it.



Regards

Dave


..andy

To email, substitute .nospam with .gl

"Big D" wrote in message
news:tJzyc.30$oO2.20@newsfe1-win...
Good Morning all,

I've just had a new combi boiler put in by those ever so nice British Gas
people, however we have one problem with it....

Whenever we flush the toilet it starts to fill up the cistern and when it
has finished there is an almighty bang (its more like a VOOMF than a
BANG).

It is quite scary for our cats but its also annoying and worrying...

At the moment we have a mini float valve in the cistern, is that up to the
job? it is the original valve from when the house was built over 20 years
ago?

Can anyone suggest a solution to my problem please.

Sounds like a shock arrestor should be installed on the mains pipe.

"IMM" wrote in message
...

"Big D" wrote in message
news:tJzyc.30$oO2.20@newsfe1-win...
Good Morning all,

I've just had a new combi boiler put in by those ever so nice British
Gas
people, however we have one problem with it....

Whenever we flush the toilet it starts to fill up the cistern and when
it
has finished there is an almighty bang (its more like a VOOMF than a
BANG).

It is quite scary for our cats but its also annoying and worrying...

At the moment we have a mini float valve in the cistern, is that up to
the
job? it is the original valve from when the house was built over 20
years
ago?

Can anyone suggest a solution to my problem please.

Sounds like a shock arrestor should be installed on the mains pipe.

According to the chap who came round from BG thats whats making the bang,
its when the cistern is full and cuts off the water supply, the sudden stop
caused the bang.

"Big D" wrote in message
news:h0Byc.184$QQ2.62@newsfe5-win...

"IMM" wrote in message
...

"Big D" wrote in message
news:tJzyc.30$oO2.20@newsfe1-win...
Good Morning all,

I've just had a new combi boiler put in by those ever so nice British
Gas
people, however we have one problem with it....

Whenever we flush the toilet it starts to fill up the cistern and when
it
has finished there is an almighty bang (its more like a VOOMF than a
BANG).

It is quite scary for our cats but its also annoying and worrying...

At the moment we have a mini float valve in the cistern, is that up to
the
job? it is the original valve from when the house was built over 20
years
ago?

Can anyone suggest a solution to my problem please.

Sounds like a shock arrestor should be installed on the mains pipe.

According to the chap who came round from BG thats whats making the bang,
its when the cistern is full and cuts off the water supply, the sudden
stop
caused the bang.

Get one fitted then. http://www.bes.ltd.uk sell them at about a tenner plus
the tee fitting to screw it into.

"Big D" wrote in message
news:tJzyc.30$oO2.20@newsfe1-win...
Good Morning all,

I've just had a new combi boiler put in by those ever so nice British Gas
people, however we have one problem with it....

Say no more!


Whenever we flush the toilet it starts to fill up the cistern and when it
has finished there is an almighty bang (its more like a VOOMF than a
BANG).

It is quite scary for our cats but its also annoying and worrying...

At the moment we have a mini float valve in the cistern, is that up to the
job? it is the original valve from when the house was built over 20 years
ago?

Can anyone suggest a solution to my problem please.

Presumably it also pulses when you operate a cold tap elsewhere but you may
not have noticed this.
One scenario is for the opening of the ball-float valve to create a pressure
change within the pipework leading to a travelling wave effect through the
boiler which momentarily operates the flow sensor and the boiler tries to
start. Things to check would include but not be limited to:
All the hot and cold pipes within the house are fully cleared of air with
particular attention to the hot pipes.
The taps/shower valve/washine machines solenoids are in good condition.
None of the appliances contain surge arresters in their hot circuits
Your pipes are not excessively long plastic type which can allow surge
expansion to travel through the boiler and then recover.
Its also worth double checking that your bg pals didn't connect the wc to
the hot pipework!