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Troubleshooting - Bosch Optiflow GWH16 3 CT E23 F6 L S2405 Installation Manual

Gas continuous flow water heaters
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7

Troubleshooting

Fitting, maintenance and repair must only be carried out by authorised technicians. The following table describes the possible
solutions.
Display
A0
A1
A4
A6
A8
A7
A9
C7
CA
CF
C1
Table 11
Optiflow
Description
Cold and hot temperature sensor damaged.
Temperature inside the water heater housing is high
(heat exchanger calcified or sooted).
Faulty air temperature sensor.
Faulty inlet water temperature sensor.
Faulty mixed water temperature sensor.
Faulty hot water outlet temperature sensor.
Hot water outlet temperature sensor is not fitted
properly.
Low incoming gas pressure.
Faulty fan.
Water flow above maximum specified value.
Blocked flue gas outlet.
Air flow insufficient for start-up.
Troubleshooting | 19
Possible solution
▶ Check temperature sensor and associated
connections.
▶ If the problem persists, call an authorised
service technician.
The appliance automatically regulates its
performance to avoid overheating.
▶ If the problem persists, call an authorised
service technician.
▶ Call an authorised service technician.
▶ Check temperature sensor and associated
connections.
▶ If the problem persists, call an authorised
service technician.
▶ Check temperature sensor and associated
connections.
▶ If the problem persists, call an authorised
service technician.
▶ Check temperature sensor and associated
connections.
▶ If the problem persists, call an authorised
service technician.
▶ Check temperature sensor and associated
connections.
▶ If the problem persists, call an authorised
service technician.
▶ Check if the fan is properly connected to
ECU.
▶ If the problem persists, call an authorised
service technician.
▶ Check incoming water pressure.
▶ Install a pressure limiting valve if necessary.
▶ Remove dirt or any other impediment in the
flue and air inlet.
▶ Close and open a hot water tap.
▶ If the problem persists, call an authorised
service technician.
6 720 817 545 (2016/02)

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