Flame Rod - Navien NCB-150E Service Manual

8. Remove the four screws from the bottom of the fan assembly.
9. Detach the fan motor from the assembly and replace it with
the new part.
10. Replace the 4 screws used to attach the fan motor to the
assembly.
11. Reinstall the fan assembly to the bracket by using the
mounting screw.
12. Attach the gas valve connection back to the fan assembly by
using the 4 screws as shown in Figure 5.
13. Reconnect the wiring connector from the fan assembly.
14. Turn on water supply, power supply, and gas supply to the
unit.
NOTE
Do not over-tighten the screws for the fan motor replacement
with high torque drill. This may cause damage to the part(s).

6.2.4 Flame Rod

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.
4. Remove the Ignition Transformer insulated cables.
136 NCB-E Service Manual
Figure 6
5. Remove the 2 screws from the flame rod as shown in Figure 7
below.
Figure 7
6. Remove the flame rod wiring connector.
Figure 8
7. Remove the flame rod from the burner assembly and replace
with the new part.
8. Reconnect the 2 ignition transformer insulated cables to the
new flame rod.
9. Place the new flame rod back onto the burner assembly and
secure it by using the 2 screws from Figure 7.
10. Turn on water supply, power supply, and gas supply to the
unit.
NOTE
Always use new factory gaskets included with the flame rod
when replacing the part onto the burner assembly.
Version 1.4