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Thanks kevplumb, but I can't open the image

I'm a complete novice at this, where will I find the 3 port divertor valve in boiler, and how do I change it to manual. Thanks in advance

Its not overheating, other than the rads don't come on at all, the boiler seems to be working fine. What do you mean lockout on overheat. Holty, its definitely a Heatslave Junior, its wall mounted, and about 20 years old :(

I have a Worcester Heatslave Junior. The problems with it is that I can get hot water, but no heating, if I turn the heating dial to on and turn the room thermostat to full the boiler fires up for about a minute but it then cut out.