New Syrian Government Changes To School...
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For more on marking an answer as the "Best Answer", please visit our FAQ.have you tried bleeding the radiators that are not heating up. This is a small plug at the top which you loosen to allow the air to escape.
If you have just started using the central heating, perhaps in a new house, the return valve on the radiator may be closed off.This is a screw plug in the pipework to/from the radiator and can be adjusted using a screwdriver. hope this helps