VITODENS 200 WB2A - Heatingspares247.com

9 Replacement of Parts9.11 DHW Thermistor (A) (Combi only)a) Gain access by following step 9.1(b).b) Isolate the DHW circuit closing the DHW inlet valve. Drain the DHW circuit byopening any DHW tap below the level of the boiler.c) The DHW thermistor is situated over the domestic hot water outlet above thepiping frame.d) Disconnect the two electrical connections from the thermistor.e) Slide out the clip securing the thermistor in position and pull out the thermistor.NOTE: There may be a small discharge of water hence precautions should be taken.f) Replace the thermistor and reassemble in reverse order.g) Finally, open the DHW inlet valve, ensure that the outer casing is secured inposition and carry out an ignition and hot water temperature check.9.12 DHW Comfort Sensor (B) (Combi only)a) Gain access by following step 9.1(b).b) The DHW Comfort sensor is situated at the front of the domestic hot water heatexchanger.c) Disconnect the two electrical connections from the sensor.d) Remove the sensor by sliding upwards out of its housing.e) Replace the sensor as reverse of removal.f) Finally, ensure that the outer casing is secured in position and carry out anignition and hot water temperature check.60