Dhw Heat Exchanger - Navien NCB-700-2S+/42K Service Manual

6.2.13 DHW Heat exchanger

1. Turn off the gas supply to the unit.
2. Turn off the 230V power supply to the unit.
3. Turn off the water supply to the unit. Drain all water from
the appliance.
4. Remove the gas supply unit.
5. Remove the two screws at the DHW exchanger.
Figure 23
6. Replace with the new DHW Exchanger.
Replacement of Parts 113