Navien NCB700-24L, User'S Information Manual

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Troubleshooting 13
4.1 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.
4. Troubleshooting
If resetting the boiler and attempting the remedies suggested below do not resolve the problem, contact Navien Technical Assistance
Service (TAS) or a Gas Safe Registered Engineer.
Problem Possible Cause(s) What to do
No water comes out when the hot
water tap is opened.
●
Is the return adapter filter clean?
●
Is an error code displayed on the front
panel?
●
Is the boiler frozen?
●
Ensure that the shut–off valves on the hot
and cold pipes are open.
●
If an error code is displayed, refer to
“4.2 Understanding Error Codes” on
page 14.
The water from the hot water tap is
cold or turns cold and stays cold.
●
Is the hot water tap open wide enough
draw at least 1.9 litres of water per minute
(LPM) through the boiler?
●
Is an error code displayed on the front
panel?
If an error code is displayed, refer to
“4.2 Understanding Error Codes” on
page 14.
The water from the hot water tap is
not hot enough.
Is the set temperature too low?
●
Check the boiler’s temperature setting.
Refer to “3.2 Adjusting the Temperature” on
page 10.
●
Check for cross plumbing between the
cold and hot water lines.
The water from the hot water tap is
too hot.
Is the set temperature set too high?
Check the boiler’s temperature setting.
See “3.2 Adjusting the Temperature” on
page 10.
Central heating side malfunction
Is the setting temperature too low?
Check the boiler’s temperature setting.
See “3.2 Adjusting the Temperature” on
page 10.
Is there power to the system, or is the system
in standby?
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.
Is the system running for domestic hot water
(DHW)?
When the unit is heating for DHW, the
heating side does not work.
Is the filter on the heating side restricted?
Clean out filters that belong to the heating
side.