Franklin Electric Little Giant Pit+Plus 9JP2V2DA1, Installation Manual

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8
Pit+Plus
TM
Premium Simplex Package Systems
ECM Troubleshooting Guide
Condition Possible Cause Corrective Action
Pump does not shut off.
NOTE: Before troubleshooting
automatic control, check to see
that pump operates on
manual control. To do this,
disconnect electrical power,
remove piggyback plug from the
outlet, plug pump power cable
into outlet, turn on electrical
power, if pump operates the
switch is in failure mode.
Diaphragm switch Replace switch
Weak or hardened rubber diaphragm Replace rubber diaphragm
Plugged vent tube Clear vent tube of any obstructions
Dirt or sediment lodged between
retainer ring and rubber diaphgram
causing contact to remain closed
Clean area around rubber 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 pump capacity Larger pump required
Defective switch
Disconnect switch, check with 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 ensure it is
installed properly
Check valve stuck or unplugged 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 sump
Install a check valve in discharge line
Check valve leaking Inspect check valve for correct operation
Basin too small for inflow Install larger basin