Troubleshooting
3
Subject to modifications resulting from technical improvements!
Buderus Ltd. • http://www.buderus-domestic.co.uk
Servicing manual for wall-mounted condensing gas boiler 600 Series 11S/19S/24S/24C • Issued 02/2006
49
3.1.5
Checking the exhaust-gas sensor
z
Detach plug-and-socket connection on cable to exhaust-
gas sensor. Ensure that no cable is earthed (grounded) at
any point.
z
Allow the exhaust-gas sensor to cool down.
Activation temperature:
600 Series 11S / 19S / 24S / 24C: 105 °C
z
Check exhaust-gas sensor for free throughput. If
throughput is not free, the exhaust-gas sensor is defective.
z
Replace any exhaust-gas sensor found to be defective.
Ensure you use only genuine Buderus spare parts.
z
If the exhaust-gas sensor is working correctly, plug it in
once more.
3.1.6
Replacing the exhaust-gas sensor
z
Unscrew the flow-backup mounting.
z
Detach the cable plug at the exhaust-gas sensor.
z
Loosen both retaining screws on the exhaust-gas sensor.
z
Remove the exhaust-gas sensor and replace with a new
unit (fig. 50).
z
Retighten the retaining screws.
z
Reconnect the cable plug.
z
Screw the mounting into place.
Fig. 49 600 Series 11S / 19S / 24S / 24C:
Checking the exhaust-gas sensor
Fig. 50 600 Series 11S / 19S / 24S / 24C:
Replacing the exhaust-gas sensor
