128 NPE Service Manual
6. Pull out the flow sensor.
7. Replace with old flow sensor with the new part.
8. Reinstall the flow sensor into the cold water inlet pipe and
reattach the stainless clip. Ensure that the flow sensor is
properly connected to the cold water inlet pipe and that the
clip is tightly holding the two parts together.
9. Reinstall the four screws at the flow sensor to secure the part
to the heat exchanger.
10. Turn on water supply, power supply, and gas supply to the
unit.
11. Carefully open a hot water tap and ensure there are no leaks at
the flow sensor connections.
6.2.10 Buffer Tank
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 gas valve to gain access to the buffer tank (refer to
the gas valve replacement procedures).
Figure 21
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 stainless clip and four screws at the flow sensor.
Figure 19
5. Detach the 2 wire connectors that connect the flow sensor to
the PCB.
Figure 20
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