Nibe SPLIT ACVM270 - Troubleshooting Circulation Pumps

Troubleshooting circulation
pumps
Troubleshooting Wilo - (From 2014)
L
EK
LED
Protection mode diagram Wilo
60 70
80 90
100
110
30
40
50
60
70
80
90
Ambient temperature (°C)
Liquid temperature (°C)
Normal operation
Protection mode*
* The pump speed is reduced
ActionCauseIndicator lamp
- Check the connection.
- Power failure. Check supply and fuses.
The pump is not connected or is incor-
rectly connected.
Off
- No action required.Normal modeContinuous green
- Not usedNot usedFlashes green
- Check the voltage.
- Check that there are no external
pumps in the heating system.
- Check both ambient temperature and
the temperature of the circulation
pump, see illustration.
Voltage too low (< 160V) or too high (>
280V).
Alternatively overheated circulation
pump.
Flashes green/red
- Restart the pump.
- Open and clean the pump.
- If it also flashes red after the above
measure, replace the circulation pump.
Pump blocked.Flashes red
Other faults:
ActionCauseProblem
- Vent the system.Air in the system.Noise from pump.
- Open and clean the pump.Dirt in the pump.
- Replace the pump.Worn bearings.
NIBE SPLIT ACVM270Chapter 5 | Troubleshooting54