All discharge valves are open and the pump does not start
Cause Solution
Pressure setpoint is lower than the incoming pressure. Increase the pressure setpoint inside the
controller.
Incoming pressure is higher than the value set by the dP (Pressure
Drop) parameter.
Increase the dP (Pressure Drop) parameter.
The pump runs but starts and stops frequently
Cause Solution
Diaphragm tank with broken diaphragm. Replace the tank.
Minimum Frequency (FL) is set too high. Reduce the Minimum Frequency (FL) setting.
The pump exceeds the pressure set point at minimum
frequency.
Increase the Pressure Setpoint (SP) or replace the pump
with a smaller model.
The pump always runs at maximum speed
Cause Solution
There could be a problem with the pressure transmitter. Verify the system pressure reading by comparing
to a gauge.
The pressure set point is too high and the pump doesn't achieve
the pressure desired.
Change the set point.
The pump is not primed. Control the suction condition of pump.
The input circuit breaker or fuse of the system is triggered.
Cause Solution
Short circuit Check the connecting cables.
In the case of a single-phase pump, the
motor capacitor is faulty.
Replace the capacitor if it is an external one. Contact the local sales and
service representative if it is an internal capacitor.
8 Troubleshooting
34 ResiBoost INSTRUCTION MANUAL
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