Central Heating-HELP

[Stewart Devereux]

Probably see from the time of the message just been woken up by the expansion tank overflowing from the loft- sorted the blocked- the pipe that is curved that runs in from the top missed the tank-assume this is a safety overheating pipe-boiling water was running from it-Why?? Radiators red hot. Emtied some hot from the tank(its a soild fuel boiler, left on over night, water stopped, then turned rads o by moving down the therm on the tank and more boiling water from the pipe. HELP. Surely pump is working-why did water get so hot as to enter the expansion tank? therm seem to work-did it just sticks, and help advice appreciated.

-- Regards, Stu Devereux. Fax no. 08701339568 (Outside UK fax [phone]) E-mail. [e-mail]

[Codswallop]

That problem is called pumping over. You should be able to feel and hear the pump stop and start as the thermostat is turned up and down past the set temperature. If you don't get help here try the uk.d-i-y newsgroup.

[Andrew Gabriel]

Solid fuel heating works differently, because you can't turn the "burners" off. It could be that the water in the boiler actually boiled. Back when my parents had solid fuel heating, it was typically around 3am when the boiler boiled and you started hearing the odd bubble rising up the pipework and out into the expansion tank, but I don't know how yours works.

You might want to check that there's nothing stopping the boiler's damper fully closing, which would make the situation worse.