Grundfos ALPHA - Overview of Alarm and Warning Codes; Code 51 (Blocked Pump)

12.2 Overview of alarm and warning codes
Fault chart
Grundfos mini
Eye
Code on
operating
panel
Code in
Grundfos GO
Fault
E1 51 Blocked motor
E2 40 Undervoltage
E3
29
Forced
pumping
4 Overvoltage
72 Internal fault
76 Internal fault
85 Internal fault
E4 57 Dry running
E3 43
Impellers
forced forward
-
*
35 Air in media
*
This error is not shown on the operating panel. It is logged and can be
seen in Grundfos GO.
12.3 Resetting alarms and warnings manually with
Grundfos GO
1. Go to Alarms and warnings.
2. Press Reset alarm.
All current alarms and warnings have been reset. However, if
the fault causing the alarm or warning has not been removed,
the alarm or warning will appear again.
3. If you want to delete all alarms and warnings from the history
log, press Show log > Reset alarm and warning logs.
12.4 Alarm and warning code logs
Grundfos GO will save up to 40 alarms and warnings in total in the
Alarms and warnings menu.
12.5 Automatic deblocking
In case of a blocked rotor, the pump will start vibrating automatically
with a frequency of around 3 Hz during startup. Any dirt deposits
that might prevent the impeller from rotating will be broken up
swiftly, and the pump will resume normal operation.
Related information
12.8.1 Code 51 (Blocked pump)
12.6 Overheated boiler
Cause Remedy
The flow is too low. • Increase the flow.
12.7 Noise in the system
Cause Remedy
The flow is too high. • Lower the flow.
12.8 Alarms
12.8.1 Code 51 (Blocked pump)
Grundfos mini Eye is flashing red, the displays show error code E1
and the pump stops.
Cause
Remedy
The pump is blocked. Only a qualified specialist must
perform such work.
1. Isolate the pump.
2. Remove the pump head.
3. Remove the deposits.
Related information
12.5 Automatic deblocking
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English (US)