Worcester Heatslave Junior hot water no heating

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2 Nov 2009
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United Kingdom
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.
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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 :(
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Honeywell 3 port divertor valve in boiler , good chance the synchron motor in it has gone,. pull lever over to manual position to give you heat
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 a silver thing with 3 pipes to it .
Lever on side that pulls across and hooks in place ,
That is only temp repair as to get you heat and needs looking at properly.

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