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I definitely wired it back in correctly: digital camera pics of the wiring to prove it! The pump and valve were definitely cream crackered. Pump doesn't work if I wire up to supply and the less said about the motor in the 3-port the better. I'll get the multimeter out and check the other...

Within the last week, my central heating has stopped working. The hot water is working ok: both from programmer/timer and manual override. When the hot water is switched on at the programmer, the boiler fan starts up, the ignition lights up, and the water is heated without a problem and to...