Heatcraft Refrigeration Products H-IM-79D Installation & Operation Manual page 26

Beacon II Troubleshooting Guide (continued)
PROBLEM Step ACTION ITEM
E9
Multi-out to Multi-in 1.
Communication Wiring
(only shows after initial 2.
successful connection)
3.
(E9 continued)
Communication Error
Occurrence:
Break in the designated
lines will cause errors
as follows:
Line # Master
1 E9
2 E9
3 E9
4 E9
[With Beacon II Smart Controller]
Line # SMART
1 +COMM+
2 +COMM+
3 +COMM+
4 +COMM+
5 +COMM+
PROBLEM Step ACTION ITEM
888 LED display 1.
(power is below 18V and 2.
appears at initial power) 3.
4.
1.
LED displays dLy
then oFF with no 2.
displayed errors
3.
Diagnostics
Check for 24 volts power to the board
Check for crossed communication wiring
(multi-out not wired to multi-in terminals)
Check for broken communication wiring
Master
in out
1
Slave1
E9
no error
no error
no error
Beacon II Smart
Master
Controller
in out in out
1
Master
E9
no error
no error
no error
no error
Check Voltage to Evaporator Transformer
Check Transformer Secondary Output Volts
Check Voltage at Control Board (24 and C)
Check Voltage at Beacon II Smart Controller
Check for low voltage
Check for short in field wiring from "comp" on
board to condensing unit terminal connection
Replace defective contactor (holding coil)
IF OK
Go to
next step
Slave 1 Slave 2
in out in out
2
4
Slave 2
E9
E9
no error
no error
Slave 1
in out
2
5
Slave1
no error
E9
no error
no error
no error
IF OK
Go to
next step
Go to
next step.
26
IF NOT OK
1. If no voltage, see "LED is not lit" above
for low voltage, see "88888 LED display"
2. Correct wiring from "Master" unit Multi-out
to Multi-in of "Slave" unit, etc. to all Slaves
and return to Master. (See wiring diagrams)
3. Correct wiring between first Slave with
error to previous board in the sequence.
Slave 3
in out
3
Slave 3
no error
Slave 2 Slave 3
in out in out
3 4
Slave 2 Slave 3
no error no error
E9
E9
no error
no error no error
IF NOT OK
1. Check field wiring for breaks or shorts
2. Replace if necessary
3. Check factory wiring and connections
4. Check field wiring from board
1. Check all steps for "888 LED display"
Voltage could drop off too fast to show.
2. Check internal factory wiring to
compressor contactor.
E9
E9
E9
E9
E9
E9