Nibe S2125, Installer Manual, Page: 32 / 64

General
S2125 is equipped with an internal electronic controller that
handles all functions necessary for operation of the heat
pump, e. g. defrosting, stop at max/min temperature, con-
nection of the compressor heater, and protective functions
during operation.
The integrated control shows information via status-LEDs
and can be used during servicing.
Under normal operating conditions the home owner does
not need to have access to the controller.
S2125 communicates with the NIBE indoor module/control
module, which means that all settings and measurement
values from S2125 are adjusted and read off on the indoor
module/control module.
Caution
The main product’s software must be the latest
version.
LED status
The base board (AA2) has a status LED for easy control and
troubleshooting.
Explanation State LED
Base board without power Not lit PWR
(green)
Base board power on Continuous
light
CPU without power Not lit CPU
CPU running Flashes (green)
CPU not running correctly Continuous
light
No communication with indoor
module/control module
Not lit EXT COM
(green)
Communication with indoor
module/control module
Flashes
No communication with inverter Not lit INT COM
(green)
Communication with inverter Flashes
Neither defrosting nor protection
is active
Not lit DEFROST
(green)
Some protection is active Flashes
Defrosting in progress Continuous
light
No errors Not lit ERROR
(red)
Info alarm (temporary), active Flashes
Continuous alarm, active Continuous
light
Relay in de-energised position Not lit K1, K2, K3, K4,
K5
Relay activated Continuous
light
No function N-RELAY
No function COMPR. ON
Explanation State LED
Inverter without power Not lit PWR-INV
(green)
Inverter has power Continuous
light
HARMONIC FILTER (RA1)
Harmonic filter (RA1) has a status LED for easy control and
troubleshooting.
When the capacitor is in operation, LED 201 is lit with a
steady light.
Explanation State LED
Capacitor disconnected Not lit LED 201
(red)
Capacitor connected Continuous
light
Master control
To control S2125, a NIBE indoor module/control module is
required, which calls upon S2125 according to demand. All
settings for S2125 are made via the indoor module/control
module. It also shows the status and sensor values from
S2125.
Parameter
space
Value Description
4 – 14 4 °C Cut-out value activation passive
defrosting
-5 – 5 -3 °C Start temperature BT16 to calcu-
late index
Yes / No No (1 / 0) Permit fan de-icing
Yes / No No (1 / 0) Permit silent mode
Yes / No No (1 / 0) Permit defrost more often
NIBE S2125 Chapter 7 | Control 32
Control