38
Display
Action
Control unit issues a heat
demand
No
Increase set value and en-
sure heat is drawn off.
Yes
Fan starts
No
Fan starts 4 times for
approx. 50 s, followed by
fault F9
Check the fan, fan connect-
ing cables, power to the fan
and fan control.
Yes
Ignition
No
Fault 81/EE
Check ignition module (con-
trol voltage 230 V across
plugs "X2.1" and "X2.2").
Check the gas supply.
Yes
Gas train opens
No
Fault 80/EE
Check the gas train (control
voltage 230 V
∼
); check the
gas supply pressure.
Yes
Ionisation current builds
Symbol
A
No
Fault 82/EE
Check setting for ionisation
electrode.
Purge the gas line.
Yes
Burner in operation
No
Shuts down below the set
boiler water temperature and
restarts immediately.
Check the flue system for
tightness (flue gas recircula-
tion); check the gas flow
pressure.
Yes
Automatic calibration of
the combustion controller
No
Fault E3
Ensure adequate heat trans-
fer. Press reset button
R
.
Fault Eb
Check gap between ionisa-
tion electrode and burner
gauze assembly. Check allo-
cation of gas type (coding
address 82, gas train set-
ting). Check flue system; re-
move flue gas recirculation if
required. Press reset button
R
.
Fault 85/E1/E7/E9/EA
See chapter "Fault messag-
es"
For further details regarding faults, see page 89.
Commissioning, inspection, maintenance
Function sequence and possible faults
5789 302 GB
Summary of Contents for B2TB
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