Bosch OptiFlow Professional GWH12 1 CTD E23, Руководство по установке, Страница: 18 / 24

6 720 810 559 (2016/06) OptiFlow Professional
18 | Troubleshooting
8 Troubleshooting
Fitting, maintenance and repair must only be carried out by authorised technicians. The following table describes the possible
solutions.
Display Description Solution
A0 Cold and hot temperature sensor damaged. ▶ Check temperature sensor and associated
connections.
▶ If the problem persists, call an authorised
service technician.
A1 Temperature inside the water heater housing is high
(heat exchanger calcified or sooted). ▶ The appliance automatically regulates its
performance to avoid overheating.
▶ If the problem persists, call an authorised
service technician.
A4 Faulty air temperature sensor. ▶ Call an authorised service technician.
A7 Faulty hot water outlet temperature sensor. ▶ Check temperature sensor and associated
connections.
▶ If the problem persists, call an authorised
service technician.
A9 Hot water temperature sensor is not fitted properly.
Incoming gas pressure low.
▶ Check fitting.
▶ Check incoming pressure.
C7 Faulty fan. ▶ Check if the fan is properly connected to
ECU.
▶ If the problem persists, call an authorised
service technician.
CA Water flow above maximum specified value. ▶ Check incoming water pressure.
▶ Install a pressure limiting valve if necessary.
CF
C1
Blocked flue gas outlet.
Air flow sufficient for start-up.
▶ 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.
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.
Table 9