Central Heating Won't Work

Can anybody give me some advise, got a Worcester Greenstar 24i Combi boiler, I am still getting hot water, but the central heating won't come on.
I've checked the pressure and that's fine, I've tried upping the wall thermostat to maximum, the boiler is making all the right noises but it isn't sending water to the radiators, I'm getting grief from the Mrs coz it's freezing, is it something I can fix myself or professional help only, any idea of the cost, cheers.
how is turning the wall stat up to maximum going to help?
 

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