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(ii) After the above step (i), disconnect the float switch leads from the controller board within the first
5 minutes of the freeze cycle.
The unit should go into the defrost cycle after the first 5 minutes ± 20 seconds of the freeze
cycle.
(iii) Reconnect the float switch connector to the controller board. After the first 5 minutes of the
freeze cycle, disconnect the float switch leads from the controller board.
At this point, the unit should start the defrost cycle.
(iv) After step (iii), de-energize the unit and confirm that the defrost timer is in the minimum
position. Disconnect the resistor from the controller board, and energize the unit.
After the 1 minute water supply cycle, the defrost cycle starts.
Re-connect a 1.5 kΩ - 3.5 kΩ resistor to the connector K3 (pins #1 and #2) after the first
2 minutes of the defrost cycle. The unit should start the freeze cycle after 1 minute ± 5
seconds from the resistor connection.
3) Check the controller board using the controller board’s test program.
The output test switch “S3” provides a relay sequence test. With power OFF, place S3 on and
switch power to ICE. The correct lighting sequence should be none, 2, 3, 4, 1, and 4, normal
sequence every 5 seconds. S3 should remain in the “OFF” position for normal operation.