20
MT GL/GLS/UL
14 GENERAL TROUBLESHOOTING GUIDE
PROBLEM
CAUSE
REMEDY
Top cover not illuminated
Light switch turned off
Turn switch on
Top cover wrongly fitted onto bowl
Fit top cover properly
Burned out bulb
Replace bulb
Bowl light wire wrongly fitted
Place it correctly to ensure contacts
Burned out transformer
Replace transformer
Overheated transformer cut off by termal
protector
Verify that the light bulbs installed in the
top covers are correct (24-28V max 21W)
Loose or broken electrical wires from
switch to bulb
Tighten connections or replace wiring
Mixers not rotating
Ice blocks inside the bowl
Remove ice blocks or let ice melt
Inoperative mixer motor
Refer to MIXER MOTOR NOT
ROTATING
Loose or broken electrical wires
Tighten connections or replace
wiring
Brix too low
Increase Brix to correct value
Mixer motor not rotating
“GLS” models: bowls and top covers are
mounted uncorrectly.
Check that bowls and top covers are
mounted correctly.
Overheated motor cut off by thermal pro-
tector
Check for proper line voltage
Check for proper product viscosity
Check for proper condenser air flow
(obstructions or inoperative fan motor)
Burned out or discontinued stator win-
ding
Replace stator
Seized rotor
Check for bushing alignment
Damaged or worn out gears in the box
Replace inoperative gears
Mix leakage from bowl
Bowl fastening hooks not properly nga-
ged
Engage bowl fastening hooks
Bowl gasket wrongly fitted
Fit bowl gasket properly around its seat
Nicked or wrong bowl gasket
Replace bowl gasket
Nicked or wrong faucet piston
O-Rings
Replace faucet piston O-Rings
Faucet piston out of closing position
Check faucet handle and/or its spring, re-
placing whichever worn out
Unit cooling but not freezing
Mixer/Refrigeration switch set to
I position
Set Mixer/Refrigeration switch to II posi-
tion
Clogged and dirty condenser
Clean condenser
Improper airflow through condenser
Allow for adequate free air on each side of
the unit
Brix too high (product too sweet)
Reduce Brix to correct value
Brix too low (poor sugar content)
Increase Brix or set density adjustment
screw to Max
Poor refrigerant charge
Detect possible leak, seal it and make
new refrigerant charge
