Navien NFB-301C Manuel D'information De L'utilisateur page 18

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.
Press and hold the Reset button on the front panel to reset the
boiler.
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
18 Troubleshooting
Possible Cause(s)
Is the setting temperature too low?
Is there power to the system, or is the system
in stand by?
Is the system running for domestic hot water
(DHW)?
What to do
Check the boiler's temperature setting.
See "3.2 Adjusting the Temperature" on
page 8.
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.