17
February 2007
Part No. 891817 Rev A
6. TROUBLESHOOTING
6.1. Troubleshooting
Tips
SYMPTOM
DIAGNOSIS & CORRECTIVE ACTION
Motor does not start or
make any noise.
•
No electrical power to the pump.
o
Check that the breaker is turned on.
o
Test for adequate voltage in the motor junction box (within 10% of
nameplate voltage).
o
Check all wiring terminations. Verify that the auxiliary AC lead is
either capped or connected to an outside device.
•
Motor has overheated and the thermal overload protector has tripped.
o
Allow the motor to cool and then re-try.
•
Motor switch is defective.
o
Turn off breaker, remove motor switch from motor junction box, and
check for continuity.
Motor does not start,
but makes humming
noise.
•
Inadequate
voltage.
o
Test for adequate voltage in the motor junction box (within 10% of
nameplate voltage).
•
Vanes or rotor are jammed.
o
Remove rotor/vanes cover plate. Check for any damage or
obstructions. Remove rotor and vanes and check that motor shaft
turns freely by hand.
Motor runs, but no flow.
•
Tank inventory is low.
o
Make sure product level is above the bottom of the suction pipe.
•
Air leak in system and pump will not prime.
o
Check for air leak at suction connection and check that all cover
plates are flat and securely fastened.
•
Supply line is blocked.
o
Remove pump and check suction line for damage or obstructions.
•
Outlet is blocked
o
Check the hose accessories for obstructions or faulty equipment.
Test without the accessory to verify.
o
Note: Under certain installation conditions, a nozzle with an anti-
drain valve may become blocked with air that the pump cannot
overcome.
•
Rotor fiber shaft key is broken, or rotor or vanes are worn.
o
Remove rotor/vanes cover plate. Check that the fiber key holds the
rotor securely in place on the shaft. Remove the rotor and vanes and
check for excessive wear. Replace parts as necessary.
•
Bypass valve is stuck in the open position.
o
Unscrew the bypass valve cover. Remove the bypass valve and
clean or replace as necessary.
•
Check valve is stuck in the open position.
o
Un-bolt the strainer cover plate. Remove the strainer and check
valve. Check for a clean seat.
