My pump sounded knackered, so I replaced it (quite easy job) this evening. I noted the water in the pipes was black, although not sludgy. The new pump duly ran for a while and all was well (although the rads seemed to take forever to even start getting lukewarm. Then the boiler stopped, as did the pump. Did usual checks (thermostat, timer switch, fuse governing power to the boiler). When I turn off and on the power to the boiler, I hear a slight relay "click" from within, but nothing. No lights, no action at all. Thermostat pot turned up/down/off and on makes no difference. No lamps lit at all - completely dead. When it DID eventually come on (with me flicking the power supply off/on/off/on repeatedly a few times) it came on and fired up, but the pump and nothing else did come on. I cannot afford to call someone out, plus my local dudes are all "2 or 3 days soonest mate" probably due to the cold snap. I've got a familly and we're freezing ... please, please, please ANY HELP WOULD BE APPRECIATED!!! I suspect the pcb circuit board might be knackered - your thoughts? If so, where would I get one from - do you know? Please help ...