Potterton Netaheat 10-16 central heating doesn't work?

It sounds like the diverter valve is not working i had the same problem

Grahame Deacon
December 2010

how do the heat exchange work

b. j.
November 2006

This action would also work if the central heating thermostat is faulty, as it bypasses the thermostats on heating and water, using only the control on the boiler, which must be turned down to a minimum to prevent scalding from overheated water until the problem is identified and remedied.

Paul
May 2005

You should check motorised valves first.These give the same problem on my 10/16.
If the heating valve has stuck you would still get hot water!
Try putting the the valve in manual ie push the lever over and lock it.If this works you know it is the valve.
Touch them to see if one is colder.
You can replace the inner only-about £30 at spares stockist or B and Q.

Roger
March 2005