Navien NCB-24LSWE, Service Manual

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32 NCB Service Manual Version 1.0
Long Key Combination Function Remarks
[Power] long key
(300 msec)
Power ON / OFF
[ECO] + [Space Heating] long key
(2 sec)
Displays error history
Accessible from <Normal
operation mode> or <Error display
mode> only.
[Eco] long key (2 sec)
Displays user parameters
Accessible from <Normal
operation mode> only.
[ECO] + [Summer/Winter]
long key (5 sec)
Parameter setting mode Available only when power is OFF.
[ECO] + [DHW] long key (5 sec)
Displays service information
Accessible from <Normal
operation mode> or <Error display
mode> only.
[Summer/Winter] + [Space Heating] long
key (5 sec)
Displays service status information
[ECO] + [Summer/Winter] + [Space Heating]
long key (5 sec)
Enters test information menu
[ECO] + [Summer/Winter] + [Space Heating]
+ [DHW] long key (5 sec)
Factory reset
Available only when power is OFF.
[RESET] + [+] long key (5 sec)
Displays version information

All buttons with LED illumination will turn on at maximum brightness when the button is pressed. After the button is
released, LED brightness will reduce to medium brightness after 5 seconds and the LED will gradually reduce over a 5 to 10
second period before it turns off.

Short Key button press is defined as a single press of a button for more than 50 msec and then releasing the button.

If the button is pressed until the Long Key reference time from initial pressing, then it will be recognised as a Long Key at
the time the conditions are met.