A SERVICE OF

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18
166240008
3/17/95
CIRCUIT BOARD DIAGNOSIS
Turn the power switch OFF, and center position. Disconnect the proximity switches and thermistors from the
circuit board. Remove a sleeve jumper from the options terminal and place it on terminals 4 and 5 of the test
plug. Turn the power switch to the ON position and remove the sleeve jumper from terminals 4 and 5. The
LED indicators will cycle on for approximately 2 seconds each in the following sequence.
1. Red D-5 (error)*
*Will only cycle if ice thickness (pot) is within factory setting
2. Green D-6 (condenser fan)
3. Green D-11(hot gas valve)
4. Green D-12 (water pump)
5. Green D-14 (relay-contractor)
6. Green D-15 (dump valve)
Failure of the LEDs to cycle in this sequence will signal a defective circuit board.
YL
YL
RH Evap.
Water
Dump
Valve
Contactor
Water
Pump
1
3
5
7
2
4
230v
115v
Voltage
Selector
Switch
GR
LH Evap.
Condenser
plug
Suction plug
Test
Plug
Options
Plug
Adjustable Ice
Thickness Pot.
Micro Processor
Stacking
Cable
Plug
Manual
Harvest
Switch
Transformer
To Stacked
Unit
(if required)
Fan
GR
RD
Error
Condenser Sensor
Suction Line Sensor
RH Evap. Switch
LH Evap. Switch
6
8
neutral
Dump
Every
Cycle
Dump
Every
3rd
Cycle
Dump
Every
5th
Cycle
Dump
Every
7th
Cycle
Sleeve Connector
Options Plug
D-15
D-13
D-14
D-12
D-10
Hot Gas
D-11
D-6
D-5
White
Brown