Troubleshooting; Solving Basic Problems - Navien NPE-180A2 Mode D'emploi

5. Troubleshooting

5.1 Solving Basic Problems

If you experience a problem with the water heater,
refer to the following chart for possible remedies.
Error codes that appear on the front panel display
are explained in the following section.
For minor problems, resetting the water heater may
resolve the issue. To reset the water heater, press the
Back button ( ) on the front panel.
If resetting the water heater and attempting the remedies suggested below do not resolve the problem, contact
an authorized technician, a licensed professional, or Technical Support at 1-800-519-8794 for service instructions.
Problem
No water comes out when
the hot water tap is opened.
The water from the hot water
faucet is cold or turns cold
and stays cold.
It takes too long for hot water
to reach the fixtures.
The water is not hot enough.
The water is too hot.
16 Troubleshooting
Possible Cause(s)
Is the cold water inlet filter clean?
Is an error code displayed on the
front panel?
Is the water heater frozen?
Is the cold water inlet filter clean?
Is the hot water faucet open wide
enough draw at least 0.5 gallons of
water per minute (GPM) through
the water heater?
Is an error code displayed on the
front panel?
If there is an external recirculation
system installed, is there a check
valve on the recirculation return
line?
Are you using the external
recirculation mode?
Is the set temperature too low?
Is the set temperature set too high?
What to do
Ensure that the shut–off valves on
the hot and cold pipes are open.
If an error code is displayed, refer
to "5.2 Understanding Error Codes"
on page 17.
Clean the cold water inlet filter. See
"4.4 Cleaning the Inlet Water Filter
and Recirculation Inlet Filter" on
page 13.
Open the hot water faucet
completely.
If an error code is displayed, refer
to "5.2 Understanding Error Codes"
on page 17.
Have a contractor install a
recirculation return line from the
furthest faucet back to the water
heater.
Check the water heater's
temperature setting. Refer to "3.2
Adjusting the Water Temperature"
on page 9.
Check for cross plumbing between
the cold and hot water lines.
Check the water heater's temperature
setting. See "3.2 Adjusting the Water
Temperature" on page 9.