Diagnostics
Beacon II Troubleshooting Guide (continued)
PROBLEM | Step | ACTION ITEM | IF OK | IF NOT OK | |
E9 | 1. | Check for 24 volts power to the board |
| 1. | If no voltage, see “LED is not lit” above |
Communication Wiring | 2. | Check for crossed communication wiring | Go to | 2. | for low voltage, see “88888 LED display” |
(only shows after initial | Correct wiring from “Master” unit | ||||
successful connection) |
| next step |
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| 3. | Check for broken communication wiring |
| 3. | and return to Master. (See wiring diagrams) |
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| Correct wiring between first Slave with | |||
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| error to previous board in the sequence. |
(E9 continued) Communication Error Occurrence:
Break in the designated lines will cause errors as follows:
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| in | out |
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| in | out |
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| in | out |
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Line # | Master |
1E9
2E9
3E9
4E9
Slave1
E9
no error no error no error
Beacon II Smart
Controller
in out
Master
in out
Slave 2
E9
E9
no error no error
Slave 1
in out
Slave 2
in out
Slave 3
E9
E9
E9
no error
Slave 3
in out
[With Beacon II Smart Controller]
Line # | SMART |
1+COMM+
2+COMM+
3+COMM+
4+COMM+
5 +COMM+
1 
2
5
Master | Slave1 |
E9 | no error |
no error | E9 |
no error | no error |
no error | no error |
no error | no error |
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Slave 2 | Slave 3 |
no error | no error |
E9 | E9 |
E9 | E9 |
no error | E9 |
no error | no error |
PROBLEM | Step | ACTION ITEM | IF OK | IF NOT OK |
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888 LED display |
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1. | Check Voltage to Evaporator Transformer |
| 1. | Check field wiring for breaks or shorts |
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(power is below 18V and |
| 2. | Check Transformer Secondary Output Volts | Go to | 2. | Replace if necessary |
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appears at initial power) |
| 3. | Check Voltage at Control Board (24 and C) | next step | 3. | Check factory wiring and connections |
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| 4. | Check Voltage at Beacon II Smart Controller |
| 4. | Check field wiring from board |
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LED displays dLy | 1. | Check for low voltage |
| 1. | Check all steps for “888 LED display” |
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| Voltage could drop off too fast to show. |
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then oFF with no |
| 2. | Check for short in field wiring from “comp” on | next step. | 2. | Check internal factory wiring to |
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displayed errors |
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| board to condensing unit terminal connection |
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| compressor contactor. |
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| 3. | Replace defective contactor (holding coil) |
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