Troubleshooting - Pentair MBSP-2C Installation And Operation Manual

TROUBLESHOOTING

PRIMARY PUMP TROUBLESHOOTING
Symptom
Pump won't start or run.
Pump starts and stops too
often.
Pump won't shut off
Pump operates but delivers
little or no water
BATTERY BACKUP SYSTEM TROUBLESHOOTING
Symptom
Pump won't run:
Motor hums but pump won't run:
Pump runs but pumps very little or no water:
Pump cycles too frequently:
12
Possible Cause(s)
Pump is not plugged in. Check and see if pump is plugged into a proper outlet.
Blown fuse. If blown, replace with fuse of proper size.
If voltage under recommended minimum, check size of wiring from main switch
Low line voltage
on property. If OK, contact power company or hydro authority.
Defective motor. Replace pump.
Defective float switch. Replace float switch.
Impeller If impeller won't turn, remove lower pump body and locate source of binding.
Float obstructed Remove obstruction.
Backflow of water from piping Install or replace check-valve.
Faulty float switch Replace float switch.
Defective float switch Replace float switch.
Restricted discharge
Remove pump and clean pump and piping.
(obstacle or ice in piping)
Float obstructed Remove obstruction.
Restricted intake screen Remove the pump and clean the intake screen and the impeller.
If voltage under recommended minimum, check size of wiring from main switch
Low line voltage
on property. If OK, contact power company or hydro authority.
Something caught in impeller Remove the pump and clean out the impeller.
Worn or defective parts or
Clean impeller if plugged; otherwise replace pump.
plugged impeller
Drill a 1/16" - 1/8" (1.6mm-3.2mm) dia. hole between pump discharge & check valve
Check valve installed without
(1-2" above where the discharge pipe screws into the pump discharge and below
vent hole.
the waterline).
Restricted intake screen Remove the pump and clean out the intake screen.
Check valve is installed either
Be sure check valve is installed correctly.
backward or upside down
Check all the wiring connections.
Check for a low or defective battery.
Check that the automatic switch is free to move up and down.
Press the circuit breaker reset button on the control panel.
Check for low or defective battery.
Make sure a check valve is installed and functioning between the primary pump
discharge and the Battery Backup wye.
Check for an obstruction in the discharge pipe.
The discharge pipe length and/or height exceeds the capacity of the pump. See
Table VI, Page 11, for pump capacity.
Check for a low or defective battery.
The Positive (+) and negative (–) pump wires are reversed. Disconnect them and
reconnect correctly.
The check valve located between the discharge of the primary pump and the
Battery Backup wye is not installed or is not working properly. Install an auxiliary
check valve (see Pages 5 and 6) or replace the existing check valve as required.
Corrective Action
Corrective Action
MY1013 (03-30-2021)