Follett MCD425A/W, Operation And Service Manual

Self-flushing (when enabled)

At the completion of the 20 minute time delay, the machine checks for a cumulative one hour of ice making time 

since the last off-cycle flush . If the cumulative ice making time exceeds one hour, the machine will energize the 

drain valve P19 for 60 seconds to drain the evaporator . It will then refill with water, flush again, refill and begin 

making ice if the 

LOW BIN LED is on . If the ice making time is less than 1 hour, the machine will start and begin 

making ice without draining the evaporator .

5 

2 

1 

Start 

Run 

Compressor 

T.O.L. 

MAINTENANCE 

LOW WATER 

TIME DELAY 

SLEEP CYCLE 

MAKING ICE 

LOW BIN 

POWER 

SERVICE 

HI AMPS 

HI PRESSURE 

DRAIN CLOG 

CLEANER FULL 

High 

Pressure 

Switch 

R S 

C 

Gearmotor 

Start 

Relay 

Start 

Relay 

N 

L1 

Fan 

A  B  C  D 

Water Sensors 

RESET 

Fill 

Valve 

Drain 

Valve 

3 

4 

2 

Bin T-Stat 

Clean Switch 

Drain Clog Sensor 

P6 
P21 
P20 
P19 
P3 
P22 

P4 

AUGER 

WATER LEVELS 

BIN  P11 

HI PRS 

L1 

R 

S 

C 

RED 

WHITE 

WHITE 

BLACK 

BROWN 

BLUE 

RED 

BLACK 

YELLOW 

Compressor 

Electrical Box 

COMPRESSOR 

1 2 3 4 5 6 7 8 

BLACK 

N 

P15 

Ice Dispense Input

Capacitor

BLACK

YELLOW

OR

NO CONNECT

Diagnostic Stages

High gearmotor amps – Stage 1

The 

HI AMPS error and TIME DELAY LEDs are on indicating that the control board has sensed an over-torque 

condition at the P4 terminal (more than 3 amps from the gearmotor) or no current draw (0A) and shut the ice 

machine down (strike one) . The 

HI AMPS and TIME DELAY LEDs will remain on for 60 minutes after an over-

torque condition has occurred . The ice machine will remain off as long as these two LEDs are on . After the 

60 minute time delay, these LED lights turn off, and the control board will try to go through a normal start-up 

sequence .

Capacitor

BLACK

YELLOW

5 

2 

1 

Start 

Run 

Compressor 

T.O.L. 

MAINTENANCE 

LOW WATER 

TIME DELAY 

SLEEP CYCLE 

MAKING ICE 

LOW BIN 

POWER 

SERVICE 

HI AMPS 

HI PRESSURE 

DRAIN CLOG 

CLEANER FULL 

High 

Pressure 

Switch 

R S 

C 

Gearmotor 

Start 

Relay 

Start 

Relay 

N 

L1 

Fan 

A  B  C  D 

Water Sensors 

RESET 

Fill 

Valve 

Drain 

Valve 

3 

4 

2 

Bin T-Stat 

Clean Switch 

Drain Clog Sensor 

P6 

P21 
P20 
P19 

P3 
P22 

P4 

AUGER 

WATER LEVELS 

BIN  P11 

HI PRS 

L1 

R 

S 

C 

RED 

WHITE 

WHITE 

BLACK 

BROWN 

BLUE 

RED 

BLACK 

YELLOW 

Compressor 

Electrical Box 

COMPRESSOR 

1 2 3 4 5 6 7 8 

BLACK 

N 

P15 

Ice Dispense Input

OR

NO CONNECT

20 

MCD425A/W, R425A/W, MFD425A/W, P425A/W Ice Machines