14. Fault finding the product
Noise in the pump
Cause
There is air in the pump.
Remedy
• Let the pump run. The pump vents itself over time.
Cause
Inlet pressure is too low.
Remedy
• Increase the system pressure or check the air volume in the expansion tank, if installed.
Noise in the system
Cause
There is air in the system.
Remedy
• Vent the system.
Cause
Differential pressure is too high.
Remedy
• Reduce the pump performance at the pump or external controller.
Pump is not running, no power supply
Cause
System is switched off.
Remedy
• Check the system controller.
Cause
A fuse in the installation is blown.
Remedy
• Replace the fuse.
Cause
Power supply failure.
Remedy
• Check the power supply.
Pump is not running, normal power supply
Cause
Controller is switched off.
Remedy
• Check the controller and its settings.
Cause
Pump is blocked by impurities.
UPM3
14
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Fault finding the product
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