Manitowoc EC18, Technician'S Handbook

Page: 62 / 184

50 Part Number 80-1479-3 10/10
ICE MACHINE WILL NOT HARVEST
SCR Timer
1. Check for line voltage at terminals 1 & 2 and C & 2.
If line voltage is not present refer to toggle switch
diagnostics.
2. Check for line voltage at 2 & 6.

No line voltage
Refer to evaporator thermostat diagnostics.
Evaporator temperature must be below setpoint.

Line Voltage
Momentarily disconnect then reconnect power to #6.
3. Wait 11 minutes.

Ice machine cycles into harvest - Refer to
evaporator thermostat diagnostics.The evaporator
thermostat must open the trigger contact (#6) to
reset the freeze cycle time. If power is not broken at
# 6 the ice machine will remain in the freeze cycle
and never initiate a harvest cycle.

Ice machine remains in freeze - Replace timer.
2
C NC
NO
1
6
5
4
3
2
5
15
13
11
9
7
1
6