Troubleshooting; Solving Basic Problems - Navien NHB-055H User's Information Manual

5. Troubleshooting

5.1 Solving Basic Problems

If you experience a problem with the boiler, 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 boiler may resolve
the issue. To reset the boiler, press the Back button
( ) on the front panel.
If resetting the boiler 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
Space heating side
malfunction
Possible Cause(s)
Is the setting temperature too low?
Is there power to the system,
or is the system in standby?
Is the system running for domestic
hot water (DHW)?
What to do
Check the boiler's temperature setting. See
"3.2 Adjusting the System Temperatures" on
page 9.
Make sure the power is on, and plugged into
the outlet with the correct voltage. Press
the Power button ( ) and raise the setting
temperature. Make sure the boiler is turned
on.
When the unit is heating for DHW, the
heating side does not work.
Troubleshooting 23