Micro Matic Pro-Line MMPP4301-EP Service Manual page 14

TROUBLE
1. Excessive foam
2.
Compressor does
not start (no hum),
but the fan
motor runs.
Compressor starts
and continues to run
until freeze up and
will not cut off.
4. Compressor does
not run but hums.
5. Warm beer
14
TROUBLESHOOTING
CAUSE
A.
Warm walk-in cooler
B. Check applied pressure to keg
C. Check equipment
D. Warm product lines
A. Compressor relay or capacitor
malfunction
B. Inadequate voltage
C. Compressor failure
A. Thermostat control failure
B. Freon leak
A. Inadequate voltage
B. Starting relay malfunction
C. Compressor malfunction
A. Defective Pump
(check motor also)
B. Defective motor (check pump also)
C. Refrigeration unit not running
D. Trunk lines located in
overheated area
E. Trunk lines flooded in
PVC chase.
F. Uninsulated or poorly
insulated lines
G. Thermostat
H. Condenser fan motor not working
I. Freon Leak
J. Dirty condenser
K. Condensation inside trunk line
insulation (may be caused from
cleaning lines)
A. Adjust cooler temperature to 36° to 38° F
(use a quality thermometer)
B. Adjust setting on regulator for proper flow rate of
two (2) ounces per second.
C. Check the physical equipment from keg to faucet
D. Refer to #5
A. Replace compressor relay or capacitor
B. Measure voltage across common and run terminal
on compressor. Voltage must not drop below 90%
of rated voltage.
C. Replace compressor
A. Replace thermostat
B. Repair leak and recharge
A. Measure voltage across common and run terminal
on compressor. Voltage must not drop below 90%
of rated voltage.
B. Replace starting relay. Be sure to use correct
relay. Failure to use correct relay will cause
compressor failure.
C. Replace compressor
A. Check return line in reservoir for liquid flow. Replace
pump on 125', 250', and 500' units. Check condition of
key between pump and motor.
B. Replace motor
C. Refer to #2
D. Remove from any hot water pipes or kitchen area with
stove or glass washer.
E. Remove lines from PVC, thoroughly dry PVC and repair or
replace trunk line as needed.
F. All lines should be fully insulated from cooler into
dispenser. Includes glycol lines from power pack into
cooler.
G. Adjust temperature to colder setting.
H. Replace condenser fan motor
I. Repair leak and recharge
J. Clean the condenser
K. Check trunk housing in areas for drooping or low spots,
split insulation approximately 5" and separate. Allow any
water to drain, then air dry the seal closed.
SOLUTION