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delivered in a short space of time)
Excessive
The number of pump starts in the past
Consumption
month has exceeded the [Excessive
Consumption Limit].
(water is being delivered to the system
frequently) Pump operation will not be
affected.
Sensor Fault
No signal is being received from the
system pressure transmitter.
Valve Over Current
The Valve current has risen above the
Valve full load current by the factor set in
the Engineers menu.
Valve Under
The Valve is not drawing sufficient
Current
current.
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GRUNDFOS INSTRUCTIONS
radiators. Investigate the cause before clearing
the fault. This value can be increased if required.
Excessive water consumption can be caused by
small leaks on the system requiring frequent
top-up. Inspect the system for leaks.
This value can be increased if required.
Check the signal from the pressure transmitter
and replace if necessary.
(the pressure transmitter can be damaged by
excessive pressure, extreme temperatures,
water hammer and debris)
Test the operation of the Valve by manually
operating the Valve.
Overcurrent can indicate a worn/seized Valve
motor.
Service Valve or replace the Valve motor as
required.
Check that the voltage supply to the unit is
within the specified limits.
Test the operation of the Valve by manually
operating the Valve.
Undercurrent can indicate a damaged Valve
motor windings (open circuit).
Check the Valve fuse has not blown.
Check that the voltage supply to the unit is
within the specified limits.
Service or replace the Valve motor as required.
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