7710400 (01-06/18) 20
INSTALLER Section (en)
19.4 REPLACEMENT OF PARTS
If one or more of the following components are replaced:
• Water-fumes exchanger
• Fan
• Gas valve
• Gas nozzle
• Burner
• Flame sensing electrode
perform the Automatic Calibration procedure described below, then check and adjust the CO
2
% value as indicated in the section
“COMBUSTION ADJUSTMENT FUNCTION (CO
2
% )”.
When working on the appliance, check the condition and position of the ame sensing electrode and replace it if necessary.
AUTOMATIC CALIBRATION FUNCTION
Press and together and hold down for at least 6 seconds. When the display indicates "On" press (within 3 seconds
after pressing the previous buttons).
If the display indicates "303" the Automatic Calibration function has not been activated. Disconnect the boiler from the mains
power supply for a few seconds and repeat the procedure.
When the function is enabled, and ash on the display
After the ignition sequence, which can also take place after a few attempts, the boiler performs three operations (each lasting
approximately 1 minute) going rst to maximum power, then to ignition power and lastly to minimum power. Before moving on to
the following phase (from maximum power to ignition power and then to minimum power), and appear on the display.During
this phase, the power level reached by the boiler and the delivery temperature alternate on the display.
When
, and ash together on the display, the calibration function has terminated.
Press to leave the function. The display shows ESC.
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