Nibe S2125, Installer Manual, Page: 41 / 64

May be due to Description existing alarm Alarm text on the display Alarms
S-series
Alarms
VVM/SMO
(S2125)
Poor heating medium flow. 2 repeated LP/HP/FQ alarms within 2.5
hours.
Persistent pressure switch or
over-temperature alarm.
322 425 (108)
Lack of refrigerant.
For FQ14, the following applies:
High temperature 120 °C com-
pressor peak.
Disruption in supply voltage.
Temporary fault in inverter, 2 times within
60 minutes.
Safety stop, inverter 323 427 (110)
Disruption in supply voltage. Temporary fault in inverter, 3 times within
2 hours.
Safety stop, inverter 324 429 (112)
Disruption in supply voltage. Temporary fault in inverter, 3 times within
2 hours or continuously for 1 hour.
Mains disturbance 328 437 (120)
Incorrect connection in the invert-
er’s terminal block X1.
Poor cooling of inverter.
The inverter has temporarily reached max
working temperature, due to poor cooling
3 times within 2 hours or continuously for
1 hour.
Overheated inverter 329 439 (122)
Defective inverter.
Too high current to inverter. Current to inverter too high, 3 times within
2 hours or continuously for 1 hour.
Current too high 330 441 (124)
Low supply voltage.
Poor cooling of inverter.
The inverter has temporarily reached max
working temperature, due to poor cooling
3 times within 2 hours or continuously for
1 hour.
Overheated inverter 331 443 (126)
Defective inverter.
Disruption in supply voltage. Compressor phase is missing, 3 times
within 2 hours or continuously for 1
minute.
Phase failure 333 447 (130)
Incorrectly connected com-
pressor cable.
Defective inverter.
Compressor does not start when required,
3 times within 2 hours.
Failed compressor starts 334 449 (132)
Defective compressor.
Disruption in supply voltage.
The output current from the inverter to
the compressor has been temporarily too
high 3 times within 2 hours or continu-
ously for 1 hour.
High current load, com-
pressor
336 453 (136)
Poor heating medium flow.
Defective compressor.
Disruption in supply voltage.
The power output from the inverter has
been too high 3 times within 2 hours or
continuously for 1 hour.
High power load, compressor 337 455 (138)
Poor heating medium flow.
Defective compressor.
Fault in pressure sensor BP8,
BP9.
The pressure difference between BP9 and
BP8 has been too low at compressor start
3 times within 30 minutes.
Failed start, no pressure diff. 353 501 (184)
The compressor does not com-
press the refrigerant sufficiently.
Compressor breakdown.
The inverter’s safety function re-
duces the speed outside of the
compressor’s working range.
Compressor speed below lowest permitted
speed.
Compressor speed too low 354 503 (186)
Clogged particle filter. The flow is low. Check particle filter and
pump.
Low defrosting flow 418 523
Defective circulation pump
(charge pump).
Pressure drop in the heating sys-
tem is too large.
The base board has been replaced
with a base board for F2120.
The heat pump has the wrong base board. Incorrect PCBA in heat pump.
Change to a new PCBA suit-
able for S2125.
437 589 (216)
41 Chapter 9 | Disturbances in comfort NIBE S2125