Navien NP-180, Service Manual

Page: 70 / 179

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. 20
1
0
NR/NP
series servi
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e Manua
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68
Versi
o
n 2.0
Scenario 1
Scenario 2
No
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
Check the voltage between two wires of CN 17:
Same as supply voltage (97 -138 VAC)
Replace PCB 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?
Is the flame detection
device normally
operating?
Is the flame current
detected?
Does the igniter have proper
voltage?
No
Yes
Check the gas valve assembly