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Boiler not maintaining heat when thermostat turned down to 15 degrees, however will maintain heat at 22 degrees. Any Ideas?

When operating hot tap banging noise coming from boiler, it's an intermittent fault. Investigations to possible problem diverter valve check operation ok, plate to plate heat exchanger removed, cleaned & refit. Gas to water heat exchanger removed & refit checked out ok. Checked continuity of...