I fitted a new radiator in the hall in the summer and ever since then I have
to bleed it once a month to keep it hot. The water comes out clear and all
the other radiators are fine and it is on the ground floor.
Anyone any ideas on what it could be (I don't think it is corrosion)
Corrosion would typically result in hydrogen gas being generated in
each radiator. Most likely this is not the case here, but you can
test with a flame.
You don't say if the system is sealed or open vented.
If it's an open system then either air is being sucked in through the
vent pipe because the pipework arrangement for the feed/expansion pipe
and vent pipe are wrong or it is being introduced via a joint
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