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Troubleshooting | 55
After enter AU Technical Settings menu,
▶ Touch symbols or to select CA menu.
Display shows CA Combustion Adjust.
▶ Touch the symbol to enter CA menu.
• UC - Auto Adjust
• MA - Manual Adjust
• IC - Ionization control
• PP - P2A2
• P0 - Min. Power
Fig. 52 CA Combustion Adjust
8.11.1 UC - Auto Adjust
To enter UC Auto Adjust of Gas/Air flow;
▶ Touch symbols or to select UC menu.
▶ Touch the symbol to enter UC menu.
▶ Open hot water taps when the display shows Open Taps
message (1 tub and 2 sinks should be sufficient; when
there is enough water flow the message disappears).
Fig. 53 Auto Adjust - Open Taps
▶ Wait until indication that the calibration is completed
appears on the screen.
▶ Touch the symbol to exit UC menu.
Gas and Air auto adjustment is complete.
8.11.2 MA - Manual Adjust
Gas/Air flow adjust is also possible to perform manually (only
recommendable if automatic adjust is not possible to conclude
successfully).
Accessing the AU Technical Settings menu
▶ Touch the symbol .
Display shows P4 Information.
▶ Touch symbols or to select AU Technical
Settings menu.
▶ Touch the symbol .
Display shows Technical Settings menu (password input).
▶ Select the password. The password is 1886.
Technical Settings is completed.
Wait a few minutes until Open Taps message
appears in the display.
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The Auto Adjust process takes several
minutes.
▶ Do not interfere with the appliance
during the auto adjustment process.
In case of anomaly you will be guided to
act accordingly.
In case of failure in the auto calibration
process verify if:
▶ Gas type and pressure are correct.
▶ Vent length is according to specification.
▶ Wind conditions are stable (e.g. wind
gusts may be a cause of failure).
▶ Hot water flow is sufficient and stable
(e.g. water from a well is a potential
source of water instability).
In case of positive results for all these
actions:
▶ Exit UC menu and repeat the process.
▶ Perform manual adjustment according
to chapter 8.11.2 or contact Bosch
support line for further assistance.
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