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3 . 1 2 Checking combustion parameters
Proceed as follows to perform combustion analysis:
− Unscrew the four screws (A) and remove the front
trim (B).
− Remove the screw (C) and the combustion
analysis cap (40) and insert the combustion
analysis probe into the air box.
− Check that the values for CO2 correspond to the
values specified in the table. If the value displa-
yed differs from that specified, adjust the boi-
ler as instructed in the "Adjusting the gas valve"
section.
− Repeat combustion analysis.
Then:
− Remove the combustion analysis probes and fit
the cap back over the hole with the screw.
− Fit the front trim (B) and secure with the four
screws (A).
9
When inserting the combustion analysis probe, take
care to push it all the way in.
IMPORTANT
The safety function that shuts down the boiler if central
heating water reaches 85°C remains active even during
combustion analysis.
3 . 1 3 Autodiagnosis of primary heat exchanger cleaning
The boiler incorporates an autodiagnosis system that
uses the number of hours of operation under certain
conditions to notify the user that the primary heat
exchanger needs cleaning (error code 91).
Clean the heat exchanger using the relevant accessory
kit, then proceed as follows to reset the hour counter:
Switch off electrical power.
Unscrew the four screws (A) and remove the front trim
(B).
Hold down the combustion analysis button (CO) for at
least 4 seconds while switching electrical power back
on again .
To check that the hour counter has reset properly, switch
power to the boiler off and back on again: after all the
segments of the digital display have lit up, the display
reads out the hour count.
NOTE! Reset the hour counter every time you thoroughly
clean or replace the primary heat exchanger. To ascer-
tain the actual number of hours of boiler operation,
multiply the value displayed by 100 (e.g. value displayed
18 = 1800 hours operation; value displayed 1 = 100 hours
operation).
A
A
C
40
A
A
51
TECHNICAL ASSISTANCE SERVICE
B
A
A
CO
B
A
A
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