Combi boiler. Most times when I turn hot tap on after a few seconds it
supplies hot water. Intermittently I can run tap for ages & water doesn't
heat. Central heating is always OK. Does anyone have any idea what my
problem might be.

Thanks for looking.

Joe.

"joe" joe @theemporium.com wrote in message ...
Combi boiler. Most times when I turn hot tap on after a few seconds it
supplies hot water. Intermittently I can run tap for ages & water doesn't
heat. Central heating is always OK. Does anyone have any idea what my
problem might be.

Thanks for looking.

Joe.
Perhaps it is supplying the radiators at the time and needs time for the
motorised valve to operate.

John wrote:
"joe" joe @theemporium.com wrote in message ...
Combi boiler. Most times when I turn hot tap on after a few seconds it
supplies hot water. Intermittently I can run tap for ages & water doesn't
heat. Central heating is always OK. Does anyone have any idea what my
problem might be.

Thanks for looking.

Joe.
Perhaps it is supplying the radiators at the time and needs time for the
motorised valve to operate.

If you run the tap for 'ages' and still no hot water, the valve is
probably *stuck* (and needs to be replaced). Often you will find that
the valve has been redesigned to reduce this problem...

Cheers,

William.

On Thu, 27 Nov 2008 23:27:51 +0000, joe wrote:

Combi boiler. Most times when I turn hot tap on after a few seconds it
supplies hot water. Intermittently I can run tap for ages & water
doesn't heat. Central heating is always OK. Does anyone have any idea
what my problem might be.

Thanks for looking.

Joe.

Sounds like a water flow detectro/diaphragm or diverter valve problem,
make and model might be useful.


--
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 in message
...
On Thu, 27 Nov 2008 23:27:51 +0000, joe wrote:

Combi boiler. Most times when I turn hot tap on after a few seconds it
supplies hot water. Intermittently I can run tap for ages & water
doesn't heat. Central heating is always OK. Does anyone have any idea
what my problem might be.

Thanks for looking.

Joe.

Sounds like a water flow detectro/diaphragm or diverter valve problem,
make and model might be useful.


--
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


It's a Ferroli Optima 1001.

"joe" joe @theemporium.com wrote in message ...
Combi boiler. Most times when I turn hot tap on after a few seconds it
supplies hot water. Intermittently I can run tap for ages & water doesn't
heat. Central heating is always OK. Does anyone have any idea what my
problem might be.

Thanks for looking.

Joe.
We had this, hot water flow sensor microswitch thingy was iffy. It would
work about half of the time.
HTH Gordy

On Sat, 29 Nov 2008 02:57:01 +0000, Gordy wrote:

"joe" joe @theemporium.com wrote in message
...
Combi boiler. Most times when I turn hot tap on after a few seconds it
supplies hot water. Intermittently I can run tap for ages & water
doesn't heat. Central heating is always OK. Does anyone have any idea
what my problem might be.

Thanks for looking.

Joe.
We had this, hot water flow sensor microswitch thingy was iffy. It would
work about half of the time.
HTH Gordy

IIRC this model has a flow sensor that is essentially a paddle in water
flow which operates a micro switch.


--
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