Navien CH-180 Service manual - page 69
67
Adjust gas
pressure
PCB DIP S /W
model setting
error
Check if
there is any
debris in the
nozzle.
Adjust differential pressure to MIN between 3 stages with the gas
manometer (17
̀HЊO±1). Ąrefer to 6.2.2 Adjusting the Gas-Air
Ratio
Turn the adjusting screw under the gas block ½ turn and
restart.
When an ignition failure occurs due to a problem in supplying
gas or adjusting gas pressure, cover the blower inlet hole with
a hand at the ignition stage. If a flame occurs, check the gas
supply system.
Incorrect DIP S/W setting per model on the PCB may cause a
problem on ignition and combustion.
Ignition failure occurs if there is debris in the nozzle.
Disassemble the manifold and check the nozzle (Stage 1).
©Navien America Inc. 2010
CH series service Manual
Version 1.0