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Test points:
The Horizon PC board incorporates on-board test points that can be used to determine various electrical outputs.
The test point holes allow a standard probe to be inserted for quick voltage measurement. For 208-230 systems,
use TP-4 (L2) as the common for testing outputs for solenoids, motors, etc.
Error faults:
The Horizon PC board monitors various operating parameters including high pressure, auger gearmotor
amperage limits, clogged drain, and high and low water alarm conditions. There are two types of errors namely
"hard" or "soft" . A hard error is one that shuts the machine off and will not allow restart until the reset button is
pressed. Even cycling power will not reset a hard error. A soft error can either be automatically reset should the
condition rectify, or if power is cycled. Should an error occur, consult the troubleshooting guide in this manual or
a Follett service technician. Note: there are two types of LO WATER and HI AMPS errors as listed below.
Soft errors:
HI AMPS: The PC board monitors the amperage of the auger motor. Should the gear motor experience current
draw above the 3.8 amps limit the machine will shut down and the TIME DELAY, HI AMP, and SERVICE LED's
will be illuminated. After the time delay the machine will restart and the TIME DELAY, HI AMP, and SERVICE
LED's 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 120 seconds, a soft error will occur. The machine will shut
down, but the water feed solenoid will remain energized. Should water return, it will fi ll to the normal low sensor
and the machine will resume normal operation. The error will clear automatically.
DRAIN CLOG: The drain clog sensor, located in the plastic drain pan behind the drain solenoid, will detect the
presence of water just below the top edge of the pan. If water does not properly fl ow out of the drain pan it will
rise to the sensor, especially during a self-fl ushing purge cycle. Turning the power switch off and then back on
again will restart the ice machine.
For Serial Number D14462 higher:
HI PRESSURE: Should the refrigeration pressure rise above 425 psi, the machine will shut down and the TIME
DELAY, HIGH PRESSURE, and SERVICE LEDs 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, HIGH PRESSURE,
and SERVICE LEDs will clear.
Hard error:
HI AMPS:
1. "Two strikes" feature. If the gearmotor has a second HI AMP occurrence during the countdown period
(6 hours after a HI AMP time delay) a hard error will occur and the HI AMP and SERVICE LED's will be
illuminated. Reset button must be pressed to clear this error.
2. No current. To prevent the refrigeration system from running without gearmotor rotation the PC board will
indicate HIGH AMP and SERVICE if the drive relay is energized and there is no current draw. Reset button
must be pressed to clear this error.
For Serial Numbers below D14462:
HI PRESSURE: Should the refrigeration pressure rise above 425 psi, a hard error will occur. Even if pressure
falls back below the reset point of 295 psi, the error will not clear and the machine will not restart. Reset button
must be pressed to clear this error.
LO WATER:
1. There is a sensor in the water reservoir that reaches down to the very bottom. The machine will not start if
water is not present at this sensor.
2. A hard error will occur should water not be present within 60 seconds of power up or if the sensors are
disconnected or damaged. Reset button must be pressed to clear this error.
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.
Comp/Sol output:
The output for the compressor is labeled COMP/SOL.
15
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