©Navien America Inc. 2010 NR/NP series service Manual
88
Version 2.0
5.9. 12Error
Error occurrence conditions and check items.
DescriptionError
12E
Loss of
flame during
combustion
Check items
Does the water heater have
sufficient gas pressure?
Yes
No
Check the burner assembly, flame rod
and gas valve assembly
Check the gas pressure
Gas Pressure
Natural Gas: 5″ - 10.5″ w.c
LP Gas: 8.0 - 13.0 w.c
1. Measure, with a meter, the gas supply pressure
( NG: 5”(6” 180 MODEL) ~10.5” W.C, LP: 8”(9” 180 MODEL)~13.5” W.C)
2. Check the Gas meter Capacity.
3. Check the Gas Pipe Diameter (3/4”).
4. Check the controller DIP S/W c
apacity setting.
5. 3-stage MIN dierential gas pressure adjustment error.
6. Defective air pressure sensor.
7. Check if the nozzle is clogged.
8. Defective multi-stage valve.
9. Defective
proportional valve in the main gas valve.
10. Check if the PCB works properly.
If the system detects loss of ame during combustion, the system stops supplying
fuel, repeats restart, counts the loss
of ame incidents, and if the incident occurs 20
times in a row, displays 12E (manually cleared) on the indoor thermostat.
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