3
Figure 2
TROUBLESHOOTING
PROBLEM
PROBABLE CAUSES
CORRECTIVE ACTION
Pump will not shut off.
Plugged vent tube in power cord.
Clear vent tube of any obstruction
Sediment lodged between retainer ring and rubber
diaphragm causing contacts to remain closed.
Clean area around rubber diaphragm.
Pump plugged directly into outlet.
See Figure 1
Defective switch
Operate pump manually (see figure 1). Replace switch if
necessary. Disconnect switch, check w/ohmmeter. Open-
infinitive resistance, closed-zero. With no water present
switch should be open. Replace switch.
Weak rubber diaphragm.
Replace diaphragm.
Pump is air locked.
Shut power off for approximately 1 minute, then restart.
Repeat several times to clear air from pump. If system
includes a check valve, a 3/16” hole should be drilled
in discharge pipe approximately 2” above discharge
connections.
Liquid inflow matches or exceeds pump capacity.
Larger pump required, or multiple pumps. See capacity
sizing information.
Frozen water in discharge hose.
Thaw hose or replace hose.
Pump runs but does not discharge liquid.
Check valve installed backwards. Note: Check valve
is accessory item.
Check flow indicating arrow on check valve body to insure it
is installed properly.
Check valve stuck or plugged.
Remove check valve and inspect for proper operation.
Lift too high for pump.
Check rating table.
Inlet to impeller plugged.
Pull pump and clean.
Pump is air locked.
See above.
Frozen water in discharge hose.
Thaw hose or change out.
Pump does not deliver rated capacity.
Lift too high for pump.
Check rated pump performance.
Low voltage, speed too slow.
Check for proper supply voltage to make certain it
corresponds to nameplate voltage.
Impeller or discharge pipe is clogged.
Pull pump and clean. Check pipe for scale or corrosion.
Impeller wear due to abrasives.
Replace worn impeller.
Pump cycles continually.
No check valve in long discharge pipe allowing
liquid to drain back onto cover.
Install a check valve in discharge line.
Check valve leaking.
Inspect check valve for correct operation.
Pump will not operate.
Blown fuse.
Replace fuse.
Switch failed.
Disconnect switch plug and plug pump only into electrical
socket. If pump operates then replace switch. If pump does
not operate, have pump serviced.
Volute clogged.
Clean screen and basket.
Breather tube clogged.
Clear vent tube of any obstruction.
Diaphragm passage clogged.
Clear passage of any obstruction.
Motor failure.
Have pump serviced.
Thermal protecter activated.
Allow pump to cool.
GFCI device activated.
Inspect all electrical connections and reset GFCI.
