Navien CH-180 Service manual - page 67

65

No spark from 

electrode 

Main gas 

valve

Ignition 

failure

When no spark is made from the electrode at ignition: 

    Remove the electrode and check if there is a crack on the 

    insulator.

    Adjust the gap if there is a discharge of electricity from the 

    metallic part of the combustion room.

    Add the insulating packing to the insulator of the electrode.

    Check the input power to the ignition transformer (AC 120V). 

    If there is no trouble in the input power to the ignition trans

    former, replace the ignition transformer.

    Replace the PCB if there is a trouble in the power supply to the 

    ig-nition transformer.

    Check the insulator boots on spark wires for cracks/holes.

1. Check the primary/secondary power supply to the main gas   

     control valve.

     Check, with a tester, if the input power is DC 100V.

2. Replace the PCB if power is not supplied.

3. If power supply is normal, check if the coil is open.

4. Check if the solenoid valve works properly. 

    Feel or hear a click. 

©Navien America Inc. 2010

CH  series service Manual

Version 1.0