43
Diagnostics
SMART II
in out
Cooler or Freezer
in out
1
2
PROBLEM Step ACTION ITEM IF OK IF NOT OK
E9 Multi-out to Multi-in 1. Check for 24 volts power to the board 1. If no voltage, see “LED is not lit” above
communication wiring for low voltage, see “88888 LED display”
(only shows after initial 2. Check for crossed communication wiring Go to
successful connection) (multi-out not wired to multi-in terminals) next step
3. Check for broken communication wiring
Line # SMART Cooler or Freezer
1 +COMM+ E9
2 +COMM+ no error
Break in the designated
lines will cause errors
as follows:
PROBLEM Step ACTION ITEM IF OK IF NOT OK
88888 LED display 1. Check grounding of board
2. Check Voltage to Evaporator Transformer 1. Check eld wiring for breaks or shorts
(power is below 18V and 3. Check Transformer Secondary Output Volts Go to 2. Replace if necessary
appears at initial power) 4. Check Voltage at Control Board (24 and C) next step 3. Check factory wiring and connections
5. Check Voltage at SMART Controller II 4. Check eld wiring from board
1. Check grounding of board
2. Check for low voltage 1. Check all steps for “88888 LED display”
LED displays dLy Go to Voltage could drop off too fast to show.
then oFF with no 3. Check for short in eld wiring from “comp” on next step. 2. Check internal factory wiring to
displayed errors board to condensing unit terminal connection compressor contactor.
4. Replace defective contactor (holding coil)
[With SMART
Controller II]
Beacon II Troubleshooting Guide (continued)
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