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Bosch OptiFlow Professional GWH12 1 CTD E23 Operating Manual page 11

Gas continuous flow water heater
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E2
E4
E9
EA
EE
EF
F7
F9
FA
FC
With indication,
but without existence of
solar thermal system.
With indication
and water temperature
low.
Table 4
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.
OptiFlow Professional
Description
Faulty inlet water temperature sensor.
Air temperature sensor detects overheating (leaking
combustion products inside the combustion
chamber).
Activated thermal fuse.
Flame not detected.
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).
Troubleshooting | 11
Possible solution
▶ Check temperature sensor and associated
connections.
▶ If the problem persists, call an authorised
service technician.
▶ 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 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.
6 720 813 938 (2016/06)

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