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still working !

thanks for the superb response chaps.central heating has just decided to start working (after unplugging a few connectors to take measurements ?).ill leave it alone while its working and hopefully thats the end of it.least i wont have to buy a new pcb.well not just yet anyway.(hope im not being...

no ch demand light.pump does not run (no voltage to it).tried the microswitch with red wires, nothing happens. ive also took a few measurements if they help. overheat stat- 0.4 ohm, ch water sense- 11.43k ohm, hotwater sense-60k ohm when cold.once again any ideas much appreciated.thanks

cheers beng, i tried knocking the preheat off, no change.by linking 1+2 out the external controls are out of the equation.i think this is the gc no- 47 075 09

i forgot to ask, what is the MI?.thanks

thanks for a fast reply.in response, the boiler has external timer and room stat.selector switch is set to water and heating.green tap light is not on (except when preheating or when water is demanded).ive removed outgoing wires from 1+2 as suggested and linked them out, no joy.230v going from...

hi all. the hot water on my boiler is working fine, but the central heating will not start.there are no fault lights up.the timer and room stat are ok, ive measured 240v switching on terms 1 and 2, and tried linking 1 and 2 out but nothing happens.any ideas?.im an electrician so i can cope with...