7.5 The pump delivers too little or no water
DANGER: Crush Hazard
Moving parts can entangle or crush. Always disconnect and lock out power before
servicing to prevent unexpected startup. Failure to do so could result in death or serious
injury.
WARNING: Electrical Hazard
The permanent-magnet motor generates voltage when the shaft rotates, even if power
sources are disconnected. Never perform any electrical work if the shaft could rotate.
NOTICE:
Do NOT override the motor protection repeatedly if it has tripped. Doing so may result in
equipment damage.
Cause Remedy
The impeller rotates in the wrong
direction.
• If it is a 3-phase pump, then transpose two phase leads.
• If it is a 1-phase pump, then do the following:
Contact the local sales and service representative.
One or more of the valves are set in
the wrong positions.
• Reset the valves that are set in the wrong position.
• Replace the valves, if necessary.
• Check that all valves are correctly installed according to media flow.
• Check that all valves open correctly.
The impeller is difficult to rotate by
hand.
• Clean the impeller.
• Clean out the sump.
• Check that the impeller is properly trimmed.
The pipes are obstructed. To ensure a free flow, clean out the pipes.
The pipes and joints leak. Find the leaks and seal them.
There are signs of wear on the
impeller, pump, and casing.
Replace the worn parts.
The liquid level is too low. • Check that the level sensor is set correctly.
• Depending on the installation type, add a means for priming the pump,
such as a foot valve.
Always state the serial number of your product, see Product Description (page 10).
7 Troubleshooting
66 Flygt 3085 Installation, Operation, and Maintenance Manual
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