Vollrath U3-02 User Manual
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SECTION 5
TROUBLESHOOTING
1. PUMP MOTOR DOES NOT RUN
Power to pump is off.
Supply power to pump.
Low voltage.
Check for low voltage.
Mix pump hose jammed inside black cover/clamp.
Disconnect pump from power source. Remove four
cover/clamp thumb screws. Separate cover/clamp halves
and remove outer half. Remove jammed hose. Re-install
cover/clamp and tighten four thumb screws securely.
Allow motor thermal overload to reset. See Sec. 4.2 for
hose replacement. Do not use jammed portion of hose.
Pump motor overloaded.
Allow internal thermal overload to reset; determine
overload cause and repair.
Pressure switch on pump is defective.
Check mechanical operation and continuity of pressure
switch.
Defective motor/capacitor
Check motor amperage draw and/or capacitor. Replace
motor or capacitor.
Defective toggle switch.
Check continuity; repair or replace.
2. PUMP OPERATES BUT CYLINDER WILL NOT FILL
NOTE 1: A PROPERLY WORKING PUMP WILL FILL AN 8 OZ. CUP WITH MIX IN ABOUT 9 SECONDS.
NOTE 2: IMMEDIATELY AFTER A "BAG CHANGE" THE PUMP MAY BE UNABLE TO RE-ESTABLISH IT'S
PRIME WITH THE SYSTEM AT OPERATING PRESSURE. IN THIS CASE, TURN THE PUMP OFF. DRAW 2-3
PINTS TO REDUCE SYSTEM PRESSURE TO ZERO. TURN PUMP ON. PURGE REMAINING AIR IN MIX BAG
AND PICK-UP HOSE.
IMPORTANT: Before connecting the pick-up hose to the mix bag, purge the mix bag of air to the extent
possible.
Out of Mix.
Replenish mix supply.
MIx pump hose kinked inside black cover/clamp.
Follow mix pump hose jammed repair. (See #1 above.)
Hoses assembled incorrectly.
Refer to diagram for correct hose connections.
Mix pump hose service life is exceeded.
Reposition/replace mix pump hose. See Sec. 4.2.
Mix pump hose not connected to freezer.
Connect mix pump hose to freezer.
Ice crystals in mix.
Completely thaw mix prior to use.
Mix bag drawn against adapter.
Assure bag is clear of pick-up tube.
Foreign objects in mix.
Clear blockage. Use fresh mix.
Check valve is backwards.
Observe flow arrow for proper orientation.
3. OVERRUN TOO LOW OR NO OVERRUN
Overrun setting too low.
Increase overrun setting.
Air leak.
Tighten all hose clamps.
Air compressor not pumping air.
Contact local Stoelting Distributor.
4. OVERRUN TOO HIGH
Mix pump hose service life is exceeded.
Reposition/replace mix pump hose.
Out of mix.
Replenish mix supply.
Overrun setting too high.
Decrease overrun setting.
Pick-up leg of mix pump hose is collapsing.
See Section 4.2.
NOTE: ALSO SEE "2" ABOVE.