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5) Rell/Low Water Safety Cycle – As ice is produced, the water level in the reservoir
drops. As it drops, the upper oat switch and lower oat switch open. The upper oat
switch opens rst. Nothing occurs at this time. When the lower oat switch opens, the
rell begins. The water control relay de-energizes, the low water safety circuit opens
(terminals 4 and 6 on the water control relay, 3 and 4 on the timer board), a 90 second
countdown timer begins on the timer board, and the inlet water valve energizes. The
compressor, fan motor and gear motor continue to run. The upper oat switch now
has 90 seconds to close before the low water safety timer terminates and shuts down
the unit. Once the upper oat switch closes, the water control relay energizes, the
inlet water valve de-energizes and the low water safety 90 second countdown timer
terminates. Diagnosis – Check that the water ll begins. If not, check the lower oat
switch, voltage to the inlet water valve, the water control relay, water supply, lters, and
inlet water valve screen.
7) Shutdown – The bin lls and activates the bin control proximity switch. 90 seconds
later the compressor and fan motor de-energize, then 60 seconds later the gear motor
de-energizes. Diagnosis: Check that the bin control paddle is activated and that
the proximity switch opens. If the compressor and gear motor fail to stop, check the
proximity switch and timer board relays.