On Thu, 16 Nov 2006 02:11:42 -0800, naffer wrote:

I "got a man in".
That's how I know that the thermistors are OK as is the pump. The
thermistors were replaced and the pump was shown to be running at 2400
rpm or so, its rated speed.

The problem is that if it's the control board both the Potterton
handbook and the diagnostics in the "bloke's" laptop says, "Do not
change the Control Board unless the display is showing an error code".


Since there's no error code showing, the "bloke" says it isn't the
control board, which, of course, it might be.

If cetltd do a spare board it's worth a try. The thermistors would be the
first port of call, especially the main working one. In principle there
must be ways for the PCB to go down without it telling you it's gone down?!
What if there a short on it?

The manual is possibly trying to resist the culture of 'blame the PCB when
you don't know what's wrong'.



--
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
Gas Fitting Standards Docs he http://www.makewrite.demon.co.uk/GasFittingStandards