Nibe S2125, Installer Manual, Page: 40 / 64

Alarm list
May be due to Description existing alarm Alarm text on the display Alarms
S-series
Alarms
VVM/SMO
(S2125)
Poor flow. 5 repeated alarms for low low-pressure
within 4 hours.
Low lp cooling 212 156 (80)
Significant wind effect.
Fan blocked or not connected.
5 unsuccessful start attempt. Fan alarm from heat pump 233 224 (182)
Connection, supply line return line
switched around,
Return is hotter than flow. Exchange Sensors
flow / return
234 225 (8)
Open-circuit or short-circuit on
sensor input.
Sensor fault BT3.
Sensor fault BT12. Sensor fault from heat pump 530
531 227 (34)
227 (36)
Sensor fault BT14. 532 227 (38)
Sensor fault BT15. 533 227 (40)
Sensor fault BT16. 534 227 (42)
Sensor fault BT17. 535 227 (44)
Sensor fault BT28. 536 227 (46)
Sensor fault BP8. 538 227 (50)
Sensor fault BP9. 539 227 (52)
Sensor fault BT84. 541 227 (56)
System temperature and/or flow
too low.
10 failed consecutive defrostings. Unsuccessful defrosting 236 228 (2)
Insufficient available system
volume.
Significant wind effect.
Poor flow, poor heat transfer.
Operation is stopped from the indoor sec-
tion after less than 5 minutes.
Short run times for com-
pressor
237 229 (4)
Incorrect settings for heating
and/or hot water.
Disruption in the refrigerant cir-
cuit.
3 repeated alarms for high discharge
within 4 hours.
Hot gas alarm 238 230 (78)
Lack of refrigerant.
Lack of refrigerant.
5 repeated alarms for low evaporation
temperature within 4 hours.
Low evaporation temp 240 232 (76)
Blocked expansion valve.
Significant wind effect.
Poor connection between PCB
and inverter.
Alarm 203 from heat pump for 20
seconds.
Communication fault to In-
verter
254 264 (203)
Inverter unpowered or broken.
Defective inverter. Discharge
sensor (BT14) has come loose
from its mount.
The inverter has tried to heat up the
compressor, but has failed.
Fault in inverter. Heating not
working.
494 298 (92)
The discharge sensor, BT14, or
high pressure sensor, BP9, has
come loose and is not giving cor-
rect measurement values.
Sensor BT14 or BP9 has come loose or is
otherwise defective.
Sensor BT14 or BP9 loose or
defective
495 300 (94)
Poor airflow, e.g. because of
leaves, snow or ice.
10 repeated defrostings according to the
protection conditions.
Recurring
safety defr.
291 341 (6)
Lack of refrigerant.
Lack of refrigerant.
5 repeated low pressure alarm within 4
hours.
Recurring low pressure 294 344 (72)
Blocked expansion valve.
Disruption in the refrigerant cir-
cuit.
Clogged particle filter, air or stop-
page in the heating medium flow.
5 repeated high pressure alarm within 4
hours.
Recurring high pressure 295 346 (74)
Poor system pressure.
The inverter is not compatible
Initiation fault, inverter. Unspecified faults 314 400 (207)
The inverter is not compatible 400 (209)
Configuration file missing. 400 (211)
Charge error configuration. 400 (213)
NIBE S2125 Chapter 9 | Disturbances in comfort 40