My new young neighbours tell me that they cannot get hot water from their
combi-boiler unless the central heating is also on. If the CH is off,
then the boiler lights on turning hot tap on, then dies.

Is this a common fault, simply answered ? or do the experts here need the
make and model etc. ?

I'm simply trying to be a helpful neighbour in this case.

Terry

Terry wrote:

My new young neighbours tell me that they cannot get hot water from their
combi-boiler unless the central heating is also on. If the CH is off,
then the boiler lights on turning hot tap on, then dies.

Is this a common fault, simply answered ? or do the experts here need the
make and model etc. ?

yes, yes, might help (but the answer will probably be the same...)

I'm simply trying to be a helpful neighbour in this case.

Tell em it sounds like their diversion valve has failed.

--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

On Sun, 02 Apr 2006 21:08:24 +0100, John Rumm wrote:

Terry wrote:

My new young neighbours tell me that they cannot get hot water from their
combi-boiler unless the central heating is also on. If the CH is off,
then the boiler lights on turning hot tap on, then dies.

Is this a common fault, simply answered ? or do the experts here need the
make and model etc. ?

yes, yes, might help (but the answer will probably be the same...)

I'm simply trying to be a helpful neighbour in this case.

Tell em it sounds like their diversion valve has failed.

....which in many model is often moved by the DHW flow diaphragm valve,
these diaphragms are a relatively troublesome part.


--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html
Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html

Ed Sirett wrote:

My new young neighbours tell me that they cannot get hot water from their
combi-boiler unless the central heating is also on. If the CH is off,
then the boiler lights on turning hot tap on, then dies.

Is this a common fault, simply answered ? or do the experts here need the
make and model etc. ?

yes, yes, might help (but the answer will probably be the same...)


I'm simply trying to be a helpful neighbour in this case.

Tell em it sounds like their diversion valve has failed.


...which in many model is often moved by the DHW flow diaphragm valve,
these diaphragms are a relatively troublesome part.

although it does light the burner by the sounds of it - so it must have
noticed the tap is on at least...


--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

On Mon, 03 Apr 2006 01:56:46 +0100, John Rumm wrote:

Ed Sirett wrote:

My new young neighbours tell me that they cannot get hot water from their
combi-boiler unless the central heating is also on. If the CH is off,
then the boiler lights on turning hot tap on, then dies.

Is this a common fault, simply answered ? or do the experts here need the
make and model etc. ?

yes, yes, might help (but the answer will probably be the same...)


I'm simply trying to be a helpful neighbour in this case.

Tell em it sounds like their diversion valve has failed.


...which in many model is often moved by the DHW flow diaphragm valve,
these diaphragms are a relatively troublesome part.

although it does light the burner by the sounds of it - so it must have
noticed the tap is on at least...

Sorry, I missed that bit in the OP's.

--
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at http://www.diyfaq.org.uk
Gas fitting FAQ http://www.makewrite.demon.co.uk/GasFitting.html
Sealed CH FAQ http://www.makewrite.demon.co.uk/SealedCH.html
Choosing a Boiler FAQ http://www.makewrite.demon.co.uk/BoilerChoice.html