Set Appliance State:

Isolate Mains Power to appliance as per TOPs P4
CH Demand
Refit combustion chamber if this has been removed
Place telegan probe in the air inlet test point
(point 2 on diagram), ensure it is fitted
securely to prevent any release of flue gases
WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Reset appliance as necessary and allow the boiler to complete its self-check.
Set the boiler into service mode by holding down the
spanner and eco buttons for approx. 5 seconds.
Allow telegan readings to stabilise and check that:
  • O₂ levels are equal or greater than 20.6%
  • CO₂ levels are less than 0.2%