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heating not firing up?

hi help i have a potterton prima 50f which is is firing up on the hot water side of things as normal and working but the heating side of it is not firing up any ideas think poss pcb ??
geoff, December 2013
room thermostat or diverter/zone valve fault, or could even be the timer

Mr Gasman, December 2013
link Click here to see other fixes for Potterton Prima.