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hi can anyone help vaillant ecotec plus 831 is heating up one rad then then boiler cuts out with no return heat with no fault codes. checked pump, and no air locks. iv not worked with a lot vaillants in the past so any help would be good ...... thank you

why wouldnt they mate ???

hi iv just installed a Worcester greenstar classic 29kw boiler and trying to to wire a dryton thermostat programmer to it, when switched on the boiler it reaches its own heat temperature and ignores the the thermostat .... if any one could help that would be great thank you :)