Viessmann B2UA, Installation And Service Instructions Manual

Page: 57 / 200

57
Yes
Automatic calibra-
tion of the com-
bustion controller
No
Fault E3 Ensure adequate
heat transfer.
Press reset button
R .
Fault Eb Check gap be-
tween ionisation
electrode and
burner gauze as-
sembly.
Check allocation of
gas type (coding
address 82, gas
train setting).
Check flue system;
remedy flue gas re-
circulation if re-
quired.
Press reset button
R .
For further details regarding faults, see
page 124.
Setting the max. heating output
The maximum output for heating oper-
ation can be limited. The limit is set via
the modulation range. The max. adjust-
able output is limited upwards by the
boiler coding card.
Service menu
1. Press
OK and
å
simultaneously for
approx. 4 s.
2. "Service functions"
3. "Max. output"
4. "Change?" Select "Yes" .
A value is shown on the display (e.g.
"85" ). In the delivered condition, this
value represents 100 % of rated heat-
ing output.
5. Set the required value.
Commissioning, inspection, maintenance
Further details regarding the individual steps
(cont.)
5773 238 GB
Service