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Pumps can appear to be working fine, but are actually only half working. This can happen with nearly new pumps also.
Usually if the pump is failing, the furthest rads from the boiler and also on drops pipework will not work well, if at all.
Also make sure your system is balanced properly so that there are no easy circuits for the pump to do and therefore not properly heat some of the rads. If turning off some rads makes the others work better, this might mean balancing is needed
Usually if the pump is failing, the furthest rads from the boiler and also on drops pipework will not work well, if at all.
Also make sure your system is balanced properly so that there are no easy circuits for the pump to do and therefore not properly heat some of the rads. If turning off some rads makes the others work better, this might mean balancing is needed
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