Follett Tempo UCD100A30-NF Operation And Service Manual page 34

Concern
No Display or Interior
Lights
No Interior Light
Condensation on
exterior of unit
No Ice Production
Low Ice Production
Alert light flashing
Ice is too dense/not
dense enough
Standing Water in Ice
Bin
Relay and DC Outputs
One of the primary functions of the main control is to operate the multiple relay and DC outputs during each cycle.
Verify proper operation of these relays using the following procedure.
1. Enter "Relay Toggle" through the service menu.
NOTICE
Frequently toggling the compressor relay could force the compressor into overload. The compressor will
automatically deactivate during an overload and will remain deactivated until the overload switch cools.
This could take some time. It is important to allow the compressor at least 5 minutes off time between
relay cycles.
2. Toggle the relay. Its related component should activate / deactivate with the switching of the relay. If it
does not, test component.
Other Suspected Main Control Faults
If other components have been ruled out as being faulty, but the unit continues to have operating issues, it is most
likely due to a configuration error. Some configuration errors can be cleared by restoring the unit to its factory
default setting. Factory defaults may be restored through the service menu. If that does not work, check that the
board is programmed to the correct model in the service menu.
CAUTION!
Precautions must be taken while working with live electrical
equipment. Be sure to follow proper safety procedures while
performing tests on live systems.
34
Tempo Undercounter Ice Machine Bin
Potential Causes
Unit may be in Sabbath mode
Light may be set to OFF
Check LED strip for power
Defective door switch
Is unit exposed to high humidity or
high ambient temps?
Is the unit getting water?
Dirty evaporator, dirty condenser,
faulty bin thermistor
Check error log
Dirty evaporator, water starvation
Drain hose is restricted, debris in bin
drain hole, failed drain pump failed
dump valve
Action
• Tap to turn off Sabbath mode, test the door
switch circuit.
• Unplug unit, wait 5 seconds, plug back in. If main
board does not beep, check for 120V at black and
white cables on power cord.
Use component testing in service mode and test
light circuit, manually test door switch
Moisture will dissipate as ambient temp. and
humidity levels fall. Keep exterior of unit well
polished to protect surface.
Go to component testing and turn on fill valve and
verify 120V at the valve.
Clean the evaporator using U-Line cleaner, clean
the condenser coil if needed, check bin thermistor
reading in service mode.
View errors in service mode, review error and take
corrective action to resolve
Clean the evaporator if needed, check water supply,
test harvest mode, adjust ice thickness
Make sure drain hose run is as straight as possible.
Remove any kinks or tight bends, pour 1/2 gallon of
water into bin to test drain.