Version 2.21
82 NPE Service Manual
Error
Description
Check items
1. Check if gas leaks due to defective seals on the main gas valve.
2. Check if proper spark is discharged from the electrode.
3. Check if gas is supplied within the proper pressure range.
4. Check the PCB and replace if defective.
External noise current
Clean or replace flame rod
Check the current #1 of CON 10:1 - 20μA
(see page 52 for Wiring Diagram)
NO
Yes
Is the flame detected in
the burner when there is
no ignition?
Check method
Failure mode
Cause
Check method
Flame before/after
combustion
Leakage from main gas
valve
Replace the gas flame if flame occurs before combustion or if there is remaining flame
after combustion is stopped.
Error before/after
combustion
Discharge of electricity
from electrode
Spark discharges from electrode to flame sensor at ignition.
●
Replace or correct location of flame detecting rod.
Gas valve
Gas may leak as the main gas valve is pushed by the gas supply over the standard
pressure.
●
Check the supply pressure: NG: 3.5" ~ 10.5” WC, LP: 8.0" ~ 13.0"W.C
●
If the gas pressure is too high, notify the gas supplier about the issue, and if
necessary, replace the gas valve.
●
If there is a gas leak close the gas supply valve and repair the unit before using the
system.
Other trouble
Defective PCB
If the issue continues despite the checking of items above, replace the PCB.
