Operation and Service Manual

HC_1810R/N, HC_2110R/N, HM_1810R/N, HM_2110R/N 17
Soft errors:
HI AMPS: The PC board monitors the amperage of the auger motor. Should the gear motor experience
current draw above the allowable limit, the machine will shut down and the TIME DELAY and HI AMP will be
illuminated. After the time delay the machine will restart and the TIME DELAY and HI AMP will clear.
LO WATER: During operation, the water level cycles between the normal low and normal high sensors. Should
the water be shut off to a running machine, a soft error will occur. The error sequence is as follows: During
operation, the water level falls to the normal low sensor, and when it does the water feed solenoid is energized.
If water is not detected at the normal low sensor within 10 seconds, a soft error will occur. The machine will
shut down, but the water feed solenoid will remain energized. Should water return, it will fill to the normal low
sensor and the machine will resume normal operation. The error will clear automatically.
HI PRESSURE: Should the refrigeration pressure rise above 425 psi, the machine will shut down and the TIME
DELAY and HIGH PRESSURE will be illuminated. After the time delay, and if the pressure has fallen back below
the reset point of 295 psi, the machine will restart and the TIME DELAY and HIGH PRESSURE will clear.
Water feed error: While in making ice mode, if the water level does not fall below the low probes for 9 minutes,
the machine will enter a 1-hour time delay soft error with the LOW WATER light flashing. After the time delay
expires, the machine will try to make ice.
SERVICE: The sensor, located in the chassis will detect the presence of water just below the top edge of the
chassis.
Hard error:
HI AMPS will light as a hard error if the gearmotor circuit is open (zero current draw). Press reset on the control
board to clear this error.
Run errors:
DRAIN CLOG: When the machine shuts down on a full bin and there has been 30 minutes of cumulative
compressor run time, the machine will purge before starting. During this purge, if water does not get below the
low probe in the reservoir within 20 seconds, the Drain Clog LED will light. The machine will continue to run but
this is an indication of a poorly draining machine and must be addressed.
Relay output indication:
Each relay on the board has an indicator light associated with its output. For example, when the relay for the
water feed solenoid is energized, the adjacent indicator light glows green.
Evaporator flushing sequence:
During operation, the purge solenoid will open in order to drain water. There are two drain settings to choose
from: High TDS or Low TDS. (There is a rocker switch behind the front cover of the machine.) The intent is to
drain the Total Dissolved Solids from the machine while it makes ice.
While ice is being made, the TDS of the water in the evaporator increases in TDS concentration. Without
periodic draining, the TDS levels will climb to very detrimental levels, levels that will cause scale to form and
cause poor machine operation. The Low TDS setting will allow the machine to operate for one hour before
going through the flushing sequence; the High TDS setting will allow the machine to run for 10 minutes before
going through the flushing sequence.
The flushing sequence toggles the purge and fill solenoids three times. That is, the purge solenoid will energize
until the water level drops below the low probe. The fill solenoid then energizes until water reaches the high
probe, and so on for 3 cycles.
Typically, High TDS might be considered levels above 200 PPM, but local experience and varying water
chemistry may compel a High TDS setting for best performance in even lower TDS levels.
Off cycle: At the completion of off-cycle time delay, the machine checks for a cumulative 30 minutes of ice
making time since the last off-cycle flush. If the cumulative ice making time exceeds 30 minutes, the machine
will open the drain valve for 60 seconds to drain the evaporator in its entirety. It will then refill with water and
begin making ice. If the ice making time is less than 30 minutes, the machine will start and begin making ice
without draining the evaporator.