Navien CH-180, Service Manual, Page: 82 / 155

Exhaust air is locked out due to condensed water drain error.
Check if the condensed water hose or the siphon is frozen.
Check if the condensed water hose is folded.
Remove bottom of trap and verify it is not plugged
8 0
Condensed
water drain
error
Condensed
water drain
error
Defective
blower
Air pressure
error
Defective air
supply/exhau
st flue
Detection
error
Replace the blower if the blower RPM is considerably low.
Deformed or
clogged flue
Exhaust gas
flows in
through the
supply pipe
Air pressure
sensor
controller
1. Check the exterior of the flue, including dent.
2. Check if rainwater is collected due to downward installation of
air supply pipe.
If the exhaust gas glows in through the air supply pipe, imperfect
combustion may cause 10E due to noise and instable APS and
RPM.
Check the installation of flue and if the standard flue is used.
If the same trouble continues after reviewing of the above items,
1. replace the air pressure sensor, or
2. replace the PCB.
<Check if the venturi is clogged.> <Defective wind pres-sure hose>
G
© Navien Ameri c a I n c . 20 1 0 CH series servi c e Manua l Version 1 .0