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how to reset 532 i boiler working ok but flashing alternating SE & 50 fault?

how do I reset 532 i flashing alternating fault reading SE & 50 following mains water sw.off to repair tap please.
Tony Evans, January 2014
Flashing SE could indicate boiler timer has been set with service interval, it would flash SE after pre-set time, usually a year. depending on how it has been set, it could cut out after full year since last service reached.

Richard-gas engineer, January 2014
There must have reset button ,refer to boiler manual ,or switch off boiler from main supply and switch on again ,air in system

ltd, January 2014