Boiler shuts down and goes to lockout Fault Fix faulty pump (not at full capacity) replace pump head faulty fan (not at full capacity) check / lubricate bearings clear debris build up replace fan assembly blocked condensate pipe work/trap clear blockage / ice plug or Increase pipe work fall faulty ionisation electrode check gap/wiring /damages blocked heat exchanger (blocked with sludge) replace or cleanse system blocked primary filter on plate exchanger clean debris from filter faulty thermistor (losing calibration) check / replace faulty overheat cut out stat (losing calibration) check / replace faulty gas valve (faulty modureg / solenoid) replace gas valve blocked bypass pipe/ no bypass adjust / install bypass faulty air pressure switch (stuck in NO position) replace air pressure switch faulty low water pressure switch (losing calibration) replace / clear blockages excess air trapped within heat exchanger Check / replace air vent…