Sometimes you may get a cold patch in the centre of the radiator and not at the top (which signifies that the radiator needs bleeding).
This is usually caused by rust deposits inside the radiator that won’t allow for the proper circulation of water.
The radiator will need flushing. This means you should take it off the wall and clean it.
Call EPM to arrange a visit.
01473 396 105
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01473 396 247