NIBE · S2125 Air/Water Heat Pump
This alarm indicates 5 repeated high pressure alarms within 4 hours, often due to poor heating medium flow, a clogged filter, or disruption in the refrigerant circuit.
Click steps to track your progress.
Check the indoor module/control module display for specific action instructions.
Turn off the system and inspect the particle filter for clogging, then clean it if necessary.
Bleed air from radiators/underfloor heating coils if the heating medium flow seems poor.
If the alarm persists, contact a qualified technician to inspect the refrigerant circuit and heating medium flow.