To quote Andy Hall, yesterday, in this thread
"If the trapped gas is air rather than hydrogen, then the cause is
likely to be different - typically air being sucked into the system
through the system vent. This is generally caused by the pipework
not being organised correctly or the pump setting being too high.
It should also be fixed, because if air is pulled into the system,
apart from being annoying, it does promote corrosion."
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