The Pump Runs At Below Standard Performance And Power Consumption; Mechanical Shaft Seal Leaks, Sealing Chamber Monitor Reports Fault And Switches The Pump Off - Grundfos AP40 Installation And Operating Instructions Manual

9.4 The pump runs at below standard
performance and power consumption
Cause
The impeller is blocked by impurities.
Remedy
• Clean the impeller.
Cause
The direction of rotation is wrong.
Remedy
• Check the direction of rotation. If it is not
correct, interchange two phases in the power
cable.
9.5 Mechanical shaft seal leaks, sealing
chamber monitor reports fault and
switches the pump off
Cause
Increased leakage when running in new
mechanical shaft seals.
Remedy
• Change the oil.
Cause
Defective oil chamber seal probe.
Remedy
• Replace the oil chamber seal probe.
Cause
Mechanical shaft seal is defective.
Remedy
• Replace the mechanical shaft seal
• After a shaft seal has been removed from the
shaft, always replace with a new shaft seal.
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