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Bosch Optiflow GWH16 3 CT E23 F6 L S2405 Installation Manual page 20

Gas continuous flow water heaters
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20 | Troubleshooting
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E0
E1
E4
E9
EA
EC
EE
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F7
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Table 11
6 720 817 545 (2016/02)
Description
Failure of control module.
Hot water temperature sensor detects overheating.
Air temperature sensor detects overheating (leaking
combustion products inside the combustion
chamber).
Activated thermal fuse.
Flame not detected.
Loss of ionization in less than 5 seconds during 5
times.
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.
Possible solution
▶ Unplug the electrical connection for 10
seconds.
▶ Reconnect and restart the appliance.
▶ If the problem persists, call an authorised
service technician.
▶ Let the appliance cool and try again.
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.
▶ 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.
Optiflow

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