Water Pressure Sensor; Space Heating Strainer - Navien NCB-150E Service Manual

6.2.12 Water Pressure Sensor

1. Turn off the gas supply to the unit.
2. Turn off the 120V power supply to the unit.
3. Turn off the water supply to the unit. Drain all water from the
appliance.
4. Disconnect the water pressure sensor wire housing.
Figure 32
5. Pull out the water pressure sensor.
6. Replace with new water pressure sensor.
7. Connect the water pressure senor wire housing.
NOTE
Always use proper O-rings at the water pressure valve
connection to ensure tight seals

6.2.13 Space Heating Strainer

(Filter Cleaning or Strainer Replacement)
1. Turn off the gas supply to the unit.
2. Turn off the 120V power supply to the unit.
3. Turn off the water supply to the unit. Drain all water from the
appliance.
4. Remove the stainless pin from the space heating strainer body.
Figure 33
5. Pull out the space heating strainer.
Figure 34
6. Replace with new strainer filter.
Figure 35
Replacement of Parts 143