7 Troubleshooting
7.1 Electrical troubleshooting
DANGER: Electrical Hazard
Troubleshooting a live control panel exposes personnel to hazardous voltages. Electrical
troubleshooting must be done by a qualified electrician.
Follow these guidelines when troubleshooting:
• Disconnect and lock out the power supply except when conducting checks that require
voltage.
• Make sure that no one is near the unit when the power supply is reconnected.
• When troubleshooting electrical equipment, use the following:
– Universal instrument multimeter
– Test lamp (continuity tester)
– Wiring diagram
7.2 The pump does not start
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.
NOTICE:
Do NOT override the motor protection repeatedly if it has tripped. Doing so may result in
equipment damage.
Cause
Remedy
An alarm signal has been
triggered on the control panel.
Check that:
• The impeller rotates freely.
• The sensor indicators do not indicate an alarm.
• The overload protection is not tripped.
The pump does not start
automatically, but can be started
manually.
Check that:
• The start level regulator is functioning. Clean or replace if
necessary.
• All connections are intact.
• The relay and contactor coils are intact.
• The control switch (Man/Auto) makes contact in both positions.
Check the control circuit and functions.
7 Troubleshooting
80
P7030, P7035, P7040 Installation, Operation, and Maintenance Manual
