Navien CH-180, Service Manual, Page: 64 / 155

6 2
Scenario1
Scenario2
Check the voltage between two wires of CN17:
Same as supply voltage (97-138 VAC)
Replace PCB Does the igniter have proper
voltage?
No
Yes
Is the igniter
electrode clean?
Is the igniter electrode
damaged?
Yes
No Clean or replace igniter electrode
Remove the burner cover plate and check the
igniter electrode.
Replace igniter assembly
Is the igniter normally
operating?
No
Yes
Check the gas valve assembly
Is the flame detection
device normally
operating?
No Is the flame current
detected?
Yes
No
Clean or replace the flame rod
Check whether ground circuit is
properly installed.
Replace PCB
Check the current of CN 19:7-20μA
Check the voltage between two wires of CN 19:
10-20VDC
Try to restart
Yes
© Navien Ameri c a I n c . 20 1 0 CH series servi c e Manua l Version 1 .0