Little Giant 14EH Series, Установка, Страница: 6 / 8

6
TROUBLESHOOTING
PROBLEM PROBABLE CAUSES CORRECTIVE ACTION
Pump does not turn on.
NOTE: Before troubleshooting automatic
control, check to see that pump operates
on manual control. To do this, unplug from
in-line float switch plug. Plug pump power
cord into wall outlet. If pump works, proceed
to check switch; if not, fault is in pump or
power supply.
Pump not plugged in. Plug in pump.
Circuit breaker shutoff or fuse removed. Turn on circuit breaker or replace fuse.
Accumulation of trash on mercury float switch. Clean float.
Mercury float switch obscruction. Check float path and provide clearance.
Defective switch.
Disconnect switch, check w/ohmmeter. Open-infinitive
resistance, closed-zero.
Defective motor. Have pump serviced.
Pump will not shut off.
Mercury switch float obstruction. Check float path and provide clearance.
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 pump capacity. Larger pump required.
Defective switch.
Disconnect switch, check w/ohmmeter. Open-infinitive
resistance, closed-zero.
Loose connection in level control wiring. Check control wiring.
Pump runs but does not discharge liquid.
Check valve installed backwards.
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 corrective action above.)
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 into basin.
Install a check valve in discharge line.
Check valve leaking. Inspect check valve for correct operation.
Basin too small for inflow. Install larger basin.