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IMM
 
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Default Potterton Puma 80 Combi


"glenn" wrote in message
.. .

"IMM" wrote in message
...

The sludge could cause the problem - in which case you will need to get
everything cleared out in due course.

If there was so much air in the system to cause this problem then it
would also cause HW problems - chekc the auto air bleed unit is working
and its dust cap is open.


And fit a strainer in the CH return pipe with a full bore valve either
side.
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Is there any reliable way to test the air bleed unit ?


It usually has a shrader valve on the top. While the system is off press
this down. If air comes out then it is malfunctioning. It should
automatically vent air out of then system.


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