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My ancient boiler, used for central heating and heating the water, will run OK for a week, then goes out. I have tried to make the pilot light impinge on the thermocouple (new one fitted recently) and it will stay lit for ever. Until - the main flame ignites, when one can see the flame being...

The circulation pump on my quite old central heating unit has stopped working. This pump is a WILO GOLD 50 which was fitted about three years ago to the unit which has been in place for over thirty years. As it will rotate OK when using the slot in the end of the shaft, I thought the...