Diagnostics, Beacon ii troubleshooting guide (continued) – Heatcraft Refrigeration Products II User Manual
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Diagnostics
Beacon II Troubleshooting Guide (continued)
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
2. Correct wiring from “Master” unit Multi-out
successful connection)
(multi-out not wired to multi-in terminals)
next step
to Multi-in of “Slave” unit, etc. to all Slaves
and return to Master. (See wiring diagrams)
3.
Check for broken communication wiring
3. Correct wiring between first Slave with
error to previous board in the sequence.
(E9 continued)
Communication Error
Occurrence:
Break in the designated
lines will cause errors
as follows:
Line #
Master
Slave1
Slave 2
Slave 3
1
E9
E9
E9
E9
2
E9
no error
E9
E9
3
E9
no error
no error
E9
4
E9
no error
no error
no error
[With SMART
Controller II]
Line #
SMART
Master
Slave1
Slave 2
Slave 3
1
+COMM+
E9
no error
no error
no error
2
+COMM+
no error
E9
E9
E9
3
+COMM+
no error
no error
E9
E9
4
+COMM+
no error
no error
no error
E9
5
+COMM+
no error
no error
no error
no error
PROBLEM
Step ACTION ITEM
IF OK
IF NOT OK
88888 LED display
1.
Check Voltage to Evaporator Transformer
1. Check field wiring for breaks or shorts
(power is below 18V and
2.
Check Transformer Secondary Output Volts
Go to
2. Replace if necessary
appears at initial power)
3.
Check Voltage at Control Board (24 and C)
next step
3. Check factory wiring and connections
4.
Check Voltage at SMART Controller II
4. Check field wiring from board
1.
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
2.
Check for short in field wiring from “comp” on
next step.
2. Check internal factory wiring to
displayed errors
board to condensing unit terminal connection
compressor contactor.
3.
Replace defective contactor (holding coil)
Master
in out
Slave 1
in out
Slave 2
in out
Slave 3
in out
1
2
3
4
SMART II
in out
Master
in out
Slave 1
in out
Slave 2
in out
1
2
3
5
Slave 3
in out
4