Navien CH-180 User's Operation Manual - Fnd Display
LED read out shows supply water temperature and pressure for space heating in 5
Sec intervals, unless shows Error code.
If an ‘Error Code’ displays on the remote controller, follow the troubleshooting chart
below before contacting your installer, service contractor or NAVIEN representative.
Troubleshooting step #1 is to turn the unit OFF and then ON to reset the Navien
combination boiler.
If after resetting and following the steps outlined below, the combination boiler does
not return to consistent operation, contact your installer, service contractor or
Navien for service instructions.
There is no water at all
when the hot water tap
is opened.
Is the cold water filter
clean?
Is the unit display flash-
ing an error code?
Is the unit frozen?
Make sure the shut–off
valves on the hot and
cold pipes are open.
Check if there is any
error code flashing on
the remote controller.
Check if there is any
error code flashing on
the remote controller.
Check unit’s temperature
setting.
Check for cross plumbing
between cold and hot
water lines.
Check unit’s temperature
setting.
Is the hot water fixture
sufficiently open to draw at
least 0.5 GPM through the
combination boiler?
Is the unit display flashing
an error code?
Is the set temperature
too low?
Is the set temperature set
too high?
The water is not hot
enough.
When the tap is
opened, there is no hot
water or the hot water
turns cold and stays
cold.
The water is too hot.
Problem
Possible Cause(s)
What to do
FND Display
Basic Troubleshooting and Frequently