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from "IMM" contains these words:

Could I have a problem other than kettling? Could it be related to
the pump?

The boiler stat could have died and it is boiling over. Get this checked.

Kettles boiler over. Boilers kettle. AIUI kettling is localised boiling.
Anything more than localised boiling should result in plumes of steam
heading for the easiest exit.

--
Roger