Version 1.4
140 NCB-E Service Manual
7. Detach the 3 wire connectors that connect the flow sensor to
the PCB.
Figure 22
8. Pull out the flow sensor.
Figure 23
9. Replace with old flow sensor with the new part.
10. Reinstall the flow sensor into heat exchange and reattach the
stainless clip. Ensure that the flow sensor is properly connected
to the heat exchanger and that the clip is tightly holding the
two parts together.
11. Reinstall the two screws at the flow sensor to secure the part to
the Domestic Cold Water Inlet Adaptor.
12. Turn on water supply, power supply, and gas supply to the
unit.
13. Carefully open a hot water tap and ensure there are no leaks at
the flow sensor connections.
12. Turn on the water supply, power supply, and gas supply to the
unit.
NOTE
Ensure that the condensate drain trap is completely inserted
into the condensate fitting to eliminate leaking. Use the pin to
secure the cap to the fitting.
6.2.9 Flow Sensor
1. Turn off the gas supply to the unit.
2. Disconnect the unit from the power supply.
3. Turn off the water supply to the unit. Drain all water from the
appliance.
4. Remove the main gas valve (refer to page 135)
5. Remove the stainless fastener.
Figure 20
6. Remove two screws of Domestic Cold Water Inlet Adaptor from
bottom of case.
Figure 21
