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4. Troubleshooting
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 (
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
No water comes out when the hot
water tap is opened.
The water from the hot water tap is
cold or turns cold and stays cold.
The water from the hot water tap is
not hot enough.
The water from the hot water tap is
too hot.
Central heating side malfunction
) on the front panel.
Possible Cause(s)
Is the return adapter filter clean?
●
Is an error code displayed on the front
●
panel?
Is the boiler frozen?
●
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?
Is the set temperature too low?
Is the set temperature set too high?
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)?
Is the filter on the heating side restricted?
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
●
"4.2 Understanding Error Codes" on
page 14.
If an error code is displayed, refer to
"4.2 Understanding Error Codes" on
page 14.
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.
Check the boiler's temperature setting.
See "3.2 Adjusting the Temperature" on
page 10.
Check the boiler's temperature setting.
See "3.2 Adjusting the Temperature" on
page 10.
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.
Clean out filters that belong to the heating
side.
Troubleshooting
13
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