37
Display
Measure
Control unit issues a heat
demand
No
Increase set value and en-
sure heat is drawn off
Yes
Fan starts
No
After approx. 51 s fault F9
Check the fan, fan connect-
ing cables, power at the fan
and fan control
Yes
Ignition
No
Fault 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 EE
Check the gas train (control
voltage 230 V
∼
); check the
gas supply pressure.
Yes
Ionisation current builds
Symbol
A
No
Fault EE
Check setting of 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 allocation of gas type
(coding address 82, gas train
setting).
Check flue system; remedy
flue gas recirculation if re-
quired.
Press reset button
R
.
For further details regarding faults, see page 88.
Commissioning, inspection, maintenance
Function sequence and possible faults
5778741