Test Points; Error Faults; Hard Errors; Soft Errors - Follett C33985 Operation And Service Manual

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.

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 8.4 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 fill 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 flow out of the drain pan it will rise
to the sensor, especially during a self-flushing purge cycle. Turning the power switch off and then back on again will
restart the ice machine.
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.
HI PRESSURE: Should the refrigeration pressure rise above 450 psi, the remote condenser's high-pressure switch
will shut down the compressor. When the pressure falls back below the reset point of 280 psi, the compressor will
restart.
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 liquid line solenoid is labeled COMP/SOL.
Horizon 1400R/N Ice Machines 15