Navien NP-180 Service Manual

Also see for NP-180: Quick installation guide Installation manual Operation & installation manual Installation manual

Contents

Navien NP-180 Service Manual Manual pdf 90 page image

©Navien America Inc. 2010 NR/NP series service Manual88Version 2.05.9. 12ErrorError occurrence conditions and check items.DescriptionError12ELoss offlame duringcombustionCheck itemsDoes the water heater havesufficient gas pressure?YesNoCheck the burner assembly, flame rodand gas valve assemblyCheck the gas pressureGas PressureNatural Gas: 5″ - 10.5″ w.cLP Gas: 8.0 - 13.0 w.c1. 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 capacity setting.5. 3-stage MIN differential 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 flame during combustion, the system stops supplyingfuel, repeats restart, counts the loss of flame incidents, and if the incident occurs 20times in a row, displays 12E (manually cleared) on the indoor thermostat.