Heatcraft Refrigeration Products 25001501 Installation & Operating Instructions Manual page 17

BEACON TROUBLE-SHOOTING GUIDE (cont'd.)
System will not run
Coil frost pattern is uneven
BEACON CONTROLLER
1. Check if red jumper wire (next to blue pot) is correctly
connected across "X" terminals
2. Check red jumper wire terminals to make sure they are
connected to the wire, not the insulation
3. Check to make sure system is correctly wired
4. Check system for low voltage or high voltage conditions;
system must have voltage between 18-30 VAC for proper
operation
5. Check if "EVAP IN" & "EVAP OUT" sensors are correctly
installed on the board & on copper tubing
6. If system has Smart Controller, check "MULTI IN" & "MULTI
OUT" connection at board & at Smart Controller to make sure
wires are not reversed
7. Check if "ROOM" sensor is connected on Beacon board
8. Check that room sensor is good by resistance check
9. Check refrigerant charge
10. If voltage is too high (above 30 volts) or too low (below
18 volts), unit will not run
1. Check evaporator coil circuits if they are feeding properly;
uneven feeding will cause uneven icing
2. If liquid line runs through cooled space, may need to be
insulated or nozzle reselected for conditions
3. If electric defrost coil for medium temperature applications,
medium temperature nozzle must be installed
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