5.4 Dry-running protection
If a dry-running alarm has been activated,
the cause should be identified before the
pump is restarted to prevent damage to
the pump.
The unit incorporates dry-running protection that
automatically stops the pump in case of dry-running.
The dry-running protection functions differently during
priming and operation.
5.4.1 Dry-running during priming
If the unit does not detect pressure and flow within 5
minutes after it has been connected to a power
supply, and the pump has started, the dry-running
alarm is activated.
5.4.2 Dry-running during operation
If the unit does not detect pressure and flow within 40
seconds during normal operation, the dry-running
alarm is activated.
5.4.3 Resetting of dry-running alarm
If the dry-running alarm has been activated, the pump
can be restarted manually by pressing [Reset]. If the
unit does not detect pressure and flow within 40
seconds after restarting, the dry-running alarm is
reactivated.
This protection is always ON.
Dry-running or water shortage.
5.5 Anti-cycling
If there is a minor leakage in the system, or a tap has
not been closed entirely, the unit will start and stop
the pump periodically. To avoid cycling, the anti-
cycling function of the unit will stop the pump and
indicate an alarm. The anti-cycling function can be
configurated in Grundfos GO.
Off
If the pump starts 40 times in a fixed pattern, an
indicator light will signal cycling. The pump will remain
in normal operation.
On
If the pump starts and stops in a fixed pattern, there is
a leakage in the system. The pump stops, Grundfos
Eye is flashing red and an indicator light is on.
The factory setting for this function is off.
Leakage in the system.
Related information
6.5 The pump starts and stops too frequently
5.6 Maximum runtime
This function is a timer that can turn off the pump if it
runs continuously for a certain amount of time. This
time period can be adjusted via Grundfos GO.
Off
The pump will run depending on the operating
conditions disregarding the continuous operation.
On
The pump will stop after the specified period of
continuous operation, and it will show the alarm
Maximum runtime exceeded. This alarm will always
need to be reset manually.
The factory setting for this function is off.
Maximum runtime exceeded.
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