Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4

Measurement:

Check the condition of the boiler's inner combustion chamber seals.
Areas to check should include:
  • Above the heat exchanger near the flue outlet.
  • The inner combustion chamber door.
  • The sight glass and electrode assembly.
  • The lower sump connection.
  • The condensate trap.