Basic Troubleshooting And Frequently Asked Questions - Navien NR-20DU User Manual

Basic Troubleshooting and Frequently Asked Questions

▪ 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 Reset button on the front panel.
▪ If resetting the water heater and attempting the remedies suggested in the following
do not resolve the problem, contact an authorized technician, a licensed professional,
or Navien Technical Support at 1-800-519-8794 for service instructions.
Problem
No water comes out
when the hot water tap is
opened.
It takes too long for hot
water to reach the fixtures.
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Possible Cause(s)
• Is the cold water inlet filter clean?
• Is an error code displayed on the
front panel?
• Is the water heater frozen?
Are you using the external
recirculation mode?
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 the
Error Code Guide.
Have a contractor install a recirculation
return line from the furthest faucet back to
the water heater.