Navien CH-180 Service manual - page 70

68

Defective air 

supply

Defective 

PCB

Defective 

air supply

Other trouble

öMainfold disassembly procedure

1. Remove 4 screws and remove the 

    ignition transformer and the venture.

3. Remove 2 manifold fixing screws.

6. Disassemble the manifold.

4. Remove 

    multi-stage valve.

7. Check the nozzles

5. Use a screw driver to 

    remove the valve.

2. Remove 6 screws (2 under and 4 upper).

Check if rainwater is collected due to downward air intake.

If the trouble continues despite the checking of above items, 

replace the PCB.

G

G

G

Stage 2  Stage 1

Stage 3

©Navien America Inc. 2010

CH  series service Manual

Version 1.0