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15
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 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 ow out of the drain pan it will rise to the sensor,
especially during a self- 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.
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