Navien CH-180, Operation Manual

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Combination water heater operation
40
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FND Display

LED read out shows supply water temperature and pressure for space heating
in 5 Sec intervals, unless shows Error code.
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Basic Troubleshooting and Frequently
Asked Questions

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 water heater.

If after resetting and following the steps outlined below, the combination water
heater does not return to consistent operation, contact your installer, service
contractor or Navien for service instructions.
Problem Possible Cause(s) What to do
There is no water at all
when the hot water tap
is opened.
• Is the cold water filter
clean?
• Is the unit display
flashing 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.
When the tap is
opened, there is no hot
water or the hot water
turns cold and stays
cold.
• Is the hot water fixture
sufficiently open to draw
at least 0.5 GPM through
the combination water
heater?
• Is the unit display
flashing an error code?
• Check if there is any
error code flashing on
the remote controller.
The water is not hot
enough.
• Is the set temperature
too low?
• Check unit‟s
temperature setting.
• Check for cross
plumbing between
cold and hot water
lines.
The water is too hot.
• Is the set temperature set
too high?
• Check unit‟s
temperature setting.
TROUBLESHOOTI
NG & ERROR
CODE
GUIDE
TRO
UBLESHOO
TI
NG & ERROR
GUIDE