For parts or assistance, call Jung Pumpen Customer Service at 1-800-642-5930
Troubleshooting
10
Hazardous voltage.
Can shock, burn, or
kill. disconnect power before attempting any service or
repair work on pump.
Hazardous impellers and unexpected starts
which can cause loss of fingers.
Keep hands away from
pump suction inlet when working on or servicing pump.
Symptom
Possible Cause(s)
Corrective Action
Motor not running
Motor protector tripped.
Allow motor to cool. Make sure pump is completely submerged. Clear debris from volute
and impeller. Check for high amp draw.
open circuit breaker or blown fuse.
replace fuse or reset breaker. If circuit breaker opens repeatedly, don’t reset it - call a
licensed electrician.
Impeller clogged or binding.
Check amp draw. If it is more than twice the nameplate amps, the impeller is locked.
Bearings and shaft may be damaged. DISCONNECT POWER, clear debris from volute,
impeller, and cutter as needed.
power cable damaged.
resistance between power cable and ground should be infinity. If any reading is less than
infinity, call a licensed electrician.
Bad control panel.
Inspect control panel wiring. Call a licensed electrician.
defective liquid level switch.
With switch disconnected from power, check continuity through switch while activating
liquid level switch. replace switch if necessary.
not enough liquid in wet well to activate
controls.
allow the liquid to rise several inches above the switch-on level.
liquid level cords tangled
untangle cords for free operation.
automatic controls defective
try running pump in manual mode. If it runs, the automatic control is at fault.
pump runs continuously
liquid level control cords tangled
untangle cords for free operation.
pump is airlocked.
stop pump for about one minute, then restart. repeat stopping and starting until the
airlock clears. If the airlock persists, DISCONNECT POWER, pull the pump and drill a
1/8” hole in the discharge pipe between the pump discharge and the check valve.
Flow in matches or exceeds the pump’s
capacity.
a larger pump or more pumps may be needed.
little or no effluent
delivered from pump
Check valve plugged, stuck shut, or
installed backwards.
Make sure check valve is installed correctly (flow arrow should point away from pump)
and functioning correctly.
system head excessive.
Consult dealer.
pump suction plugged.
DISCONNECT POWER, pull pump, inspect, and clear as needed.
Wrong voltage or not wired correctly.
Check pump’s rotation; check nameplate voltage against supply voltage (they must
match); consult a licensed electrician.
pump is air locked.
stop pump for about one minute, then restart. repeat stopping and starting until the
airlock clears. If the airlock persists, DISCONNECT POWER, pull the pump and drill a
1/8” hole in the discharge pipe between the pump discharge and the check valve.
Worn or damaged impeller.
DISCONNECT POWER, pull pump and inspect impeller. Replace if necessary.
liquid level controls incorrectly installed
or defective.
reposition or replace as necessary.
pump cycles constantly
no discharge check valve installed.
Install discharge check valve.
discharge check valve stuck open.
repair or replace check valve as necessary.
sewage wetwell too small.
Consult dealer.
liquid level controls incorrectly installed
or defective.
reposition or replace as necessary.
pump too small for inlet flow.
Consult dealer about larger pump or second pump.