6 720 817 545 (2016/02) Optiflow
20 | Troubleshooting
E0 Failure of control module. ▶ Unplug the electrical connection for 10
seconds.
▶ Reconnect and restart the appliance.
▶ If the problem persists, call an authorised
service technician.
E1 Hot water temperature sensor detects overheating. ▶ Let the appliance cool and try again.
If the problem persists, call an authorised
service technician.
E4 Air temperature sensor detects overheating (leaking
combustion products inside the combustion
chamber).
▶ Switch off at the power point and remove the
plug from the electrical socket.
Do not try to Restart the appliance.
▶ Call a service agent immediately.
E9 Activated thermal fuse. ▶ Call an authorised service technician.
EA Flame not detected. ▶ Check that the gas to the appliance has not
been turned off.
▶ Unplug the electrical connection for 10
seconds.
▶ Reconnect and restart the appliance.
▶ If the problem persists, call an authorised
service technician.
EC Loss of ionization in less than 5 seconds during 5
times.
▶ Unplug the electrical connection for 10
seconds.
▶ Reconnect and restart the appliance.
▶ If the problem persists, call an authorised
service technician.
EE Modulating solenoid valve disconnected. ▶ Check solenoid connections.
▶ If the problem persists, call an authorised
service technician.
EF Wrong gas connected. ▶ Call an authorised service technician.
F7 A flame is detected although the appliance is
switched off.
▶ Unplug the electrical connection for 10
seconds.
▶ Reconnect and restart the appliance.
▶ If the problem persists, call an authorised
service technician.
F9 Safety solenoid valve disconnected. ▶ Call an authorised service technician.
FA Fault in the gas control valve. ▶ Call an authorised service technician.
FC Buttons stuck in a 'pressed' position for more than 30
seconds.
▶ Release the button.
▶ If the problem persists, call an authorised
service technician.
Display Description Possible solution
Table 11
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