Follett Maestro Plus MC-425A/W, Maestro Plus MF-425A/W, Maestro Plus MF-P425A/W Installation, Operation And Service Manual page 23

Loss of water
During operation, the water level cycles between the normal low (D) and normal high (C) water probes - the fill
valve (P21) cycling on and off. If continuity is not detected between the common probe (B) and normal low (D)
within 10 seconds, the LOW WATER and TIME DELAY LEDs will come on and the machine will shut down for
the one hour time delay period. After the time delay, the fill valve will re-energize and wait for continuity between
the common probe and normal high before restarting. LOW WATER LED will remain ON until the water level is
satisfied.
T.O.L.
RED
Start
Relay
4
2
3
YELLOW BLACK
R
S
C
Gearmotor
A B C D
Water Sensors
R
S
C
Compressor
2 1
Start
Relay
5
Compressor
Electrical Box
WHITE
Drain Fill
Valve Valve
Bin T-Stat
Drain Clog Sensor
MC_425A/W, MM_425A/W, MF_425A/W, _P425A/W Ice Machines
Fan
WHITE
N
N
P15
L1
BLACK
L1
HI PRS
RED
P6
P21
P20
BROWN
P19
BLACK
P3
WATER LEVELS
P22
BLUE
BIN
P4
AUGER
High
Pressure
Switch
POWER
LOW BIN
MAKING ICE
SLEEP CYCLE
TIME DELAY
1 2 3 4 5 6 7 8 LOW WATER
MAINTENANCE
RESET
SERVICE
HI AMPS
HI PRESSURE
DRAIN CLOG
P11
CLEANER FULL
Clean Switch
23