©Copyright 2012 Liberty Pumps Inc. All rights reserved
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PUMP DOES NOT RUN OR HUM.
1. Line circuit breaker may be off, tripped or loose. Have certified electrician check fuse or breaker.
2. Water level in pit may be too low to activate switch. Add more water to pit.
3. Plug on power cord may not be making contact in receptacle. Check security and connection.
4. If the pump is using the series (piggyback) cord plug, the plugs may not be connected tightly together.
5. Float may be obstructed. Make sure float is free and not interfering with the pit wall or other obstruction.
6.
If all symptoms check OK, the motor winding may be open. Consult factory.
PUMP RUNS OR HUMS, BUT DOES NOT DELIVER WATER.
1. Check valve may be installed backwards or is defective. Check to make sure it is installed properly and
flapper in valve is free to move.
2. Discharge line may be blocked or frozen. Check to see if line passes through cold areas or is blocked.
3. Pump may be air-locked. Submersible models come factory equipped with a bleed hole already in base of
pump. Check to see if hole is plugged. (For added security, a 1/8” bleed hole may be drilled in the discharge
pipe of submersible models.)
4. Vertical lift is beyond pumps capability. See performance curve below for pump’s maximum lift capability
.
NOTE: At the pump’s maximum lift, there will be no flow.
5. Pump inlet may be blocked with debris. Check to make sure that inlets at base of pump are not blocked or
clogged with debris.
6. Pump Impeller may be jammed. Check for foreign material such as construction debris, stones, etc. that might
be preventing the impeller from rotating.
PUMP RUNS AND REMOVES WATER BUT DOES NOT SHUT OFF.
1. Float is stuck in the “on” position. Check to make sure the float is free to move up and down without
obstruction.
2.
Switch may be defective. Consult factory.
PUMP RUNS BUT DELIVERS VERY LITTLE WATER.
1. Vertical lift is approaching the pump’s maximum lift capability. Refer to the above maximum lift chart.
2. Pump’s inlet is partially blocked. Check to make sure the inlet is clear of debris.
3. Discharge line is partially blocked. Check line for blockage.
4.
Check valve is not opening all the way. Check for defective or blocked check valve.
MODEL HT450
PERFORMANCE CURVES
0
5
10
15
20
25
30
35
40
0
10
20
30
40
50
60
FLOW (GPM)
HEAD (FEET)
@ 180°F
@ 77°F
