Bosch Optiflow Professional GWH12 Installation Manual page 22

22 | Troubleshooting
Display
E4
E9
EA
EC
EE
EF
F7
F9
FA
FC
With indication,
but without existence of
solar thermal system.
With indication
and water temperature
low.
Table 14
Note: breakdowns diagnosed by the water heater through an indication in the LCD panel result in the blocking of the appliance for
safety reasons. Once the problem is solved, you have to press the on/off button for > 3 seconds to restart the appliance.
To locate your nearest service agent, call: AU 1300 30 70 37, NZ 0800 54 33 52.
6 720 810 560 (2016/06)
Description
Air temperature sensor detects overheating (leaking
combustion products inside the combustion
chamber).
Activated thermal fuse.
Flame not detected.
Failure ionization during operation
Modulating solenoid valve disconnected.
Wrong gas connected.
A flame is detected although the appliance is
switched off.
Safety Solenoid valve disconnected.
Fault in the gas control valve.
Buttons stuck in a "pressed" position for more than
30 seconds.
The temperature selected is lower than the minimum
power that the appliance supplies.
High incoming water temperatures, or low flow rate
can create this occurrence.
Appliance is making a resonance noise (vibration).
Possible solution
▶ 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.
▶ Call an authorised service technician.
▶ 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.
▶ Check type of gas.
▶ Check gas pressure.
▶ Check the ignition system.
▶ Check the output of combustion gases and
remove dirt or other impediment to good
extraction.
▶ Check solenoid connections.
▶ If the problem persists, call an authorised
service technician.
▶ Call an authorised service technician.
▶ Unplug the electrical connection for 10
seconds.
▶ Reconnect and restart the appliance.
▶ If the problem persists, call an authorised
service technician.
▶ Call an authorised service technician.
▶ Call an authorised service technician.
▶ Release the button.
▶ If the problem persists, call an authorised
service technician.
▶ Increase the hot water flow.
-or-
▶ Select a higher temperature.
▶ If the problem persists:
▶ Call an authorised service technician.
▶ Call an authorised service technician.
Optiflow Professional