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 temperat-
ure, connection 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/con-
trol module, which means that all settings and measure-
ment 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 six status LEDs for easy
control and troubleshooting.
ExplanationStateLED
Control board without
power
Not litPWR
(green)
Control board power onContinuous
light
CPU without powerNot litCPU
CPU runningFlashes(green)
CPU not running correctlyContinuous
light
No communication with in-
door module/control module
Not litEXT COM
(green)
Communication with indoor
module/control module
Flashes
No communication with in-
verter
Not litINT COM
(green)
Communication with invert-
er
Flashes
ExplanationStateLED
Neither defrosting nor pro-
tection is active
Not litDEFROST
(green)
Some protection is activeFlashes
Defrosting in progressContinuous
light
No errorsNot litERROR
(red)
Info alarm (temporary), act-
ive
Flashes
Continuous alarm, activeContinuous
light
Relay in de-energised posi-
tion
Not litK1, K2, K3,
K4, K5
Relay engagedContinuous
light
No functionN-RELAY
No functionCOMPR. ON
Inverter without powerNot litPWR-INV
(green)
Inverter has powerContinuous
light
HARMONIC FILTER (RA1)
Harmonic filter (RA1) has a status LED for easy control
and troubleshooting.
When the compressor is in operation, LED 201 is lit with
a steady light.
ExplanationStateLED
Capacitor disconnectedNot litLED 201
(red)
Capacitor connectedContinuous
light
33Chapter 7 | ControlNIBE S2125
7 Control
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