Navien CH-180 Service manual - 8. Replacement of Parts

©Navien America Inc. 2010

CH  series service Manual

Version 1.0

8. Replacement of Parts

8.1. Replacement Procedure

DANGER

1. When performing maintenance and/of servicing the combination boiler, 

    always turn off the electric power, gas and water shut-off valve. Wait for the 

    boiler to become cool. Be careful to avoid injury to your fingers on sharp edges.

2. Drain all water from the boiler when removing the water parts.

3. Before any disassembly, make sure you have a good diagnosis.

4. Handle all parts carefully.

5. When reassembling, prevent any foreign substance, i.e. dust, etc. from being 

    introduced into the boiler.

6. After reassembling, check for gas and water leakage. Then, test ignition. 

    Make sure that there is no gas leakage in connections by testing with soap 

    bubble solution. Bubbles indicate a gas leak that must be corrected.

7. Check the performance and operation after servicing.

NOTICE

When disassembling and reassembling the combination boiler, refer to the 

components diagram & parts list.

To remove and replace any parts on this unit, you will need a magnetic tip screwdriver 

that is at least 8 ~ 10 inches long. A flashlight and magnetic tip reach are also handy. 

Navien recommends the use of a parts tray or bowl to hold small parts and screws. All 

of the hardware is essential to the proper operation of the unit upon re-assembly.

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