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Agile you were 100% on the button. Instead of an automatic bypass value it had an isolating valve that was left completely open - therefore allowing the bypass circuit to remain at the high temp therefore not providing a route for the boiler to cool down. I have replaced this with an auto...

Sorry I may have misled. I checked this in the dark and did not look properly. Within the hotwater tank, the 22mm hw pipe has a T which route to each motorised valve. There is also a 15mm pipe before off this T which I can only assume is the bypass but I cannot see any auto valve installed...

Guys, thanks for your comments. I thought I directed you to the correct boiler diagram, but just in case click on this image below. As you can see on the 16/22 it has dotted lines showing the additional components with three additional wires for the pump overun stat. Thing is I have...

Two two port motorised valves.... It does have a pump over run stat, I am sure of it but it was only fitted on the 16/22 model and forms part of the boiler stat. I checked both of the motorised valve microswitch's which are open circuit when not engaged, and closed circuit when engaged.. as it...

Boiler: Potterton Neatheat 16/22 Programmer Potterton EP3000 The boiler is functioning correctly, however I noticed the pump runs continuously. I checked the motorised valves microswitches which are operating fine. Next I replaced the boiler thermostat (which has built in pump over run...