Scotsman NW507 Service Manual page 25

The fifth red LED is on steady:
Too High discharge pressure,
higher than 33 bar (460 PSI)
For the first 2 times, machine will
automatic reset when pressure
drop down. and the machine will
stop when high temperature occurs
the third time, ice machine will stop,
Reset mode:
And press MODE button can go to
start up cycle.
Both the third yellow LED and forth
red LED are blinking fast:
Ice thickness sensor fault
When machine start, if PC board
detect the ice thickness
machine will stop.
Reset mode:
And press MODE button can go to
start up cycle.
ON,
24
Both the fourth red LED and second
green LED are blinking fast:
5 times too long Freeze Cycle
time
Reset mode:
And press MODE button can go to
start up cycle.