JOHNSON CONTROLS
159
SECTION 8 – SERVICE
FORM 100.50-NOM6
ISSUE DATE: 8/07/2017
8
FAULTS AND LOCKOUTS
Light Emitting Diode
The light emitting diode (LED) installed on the Unit
Controller is used to indicate the functionality of the
Unit Controller and the unit. Normal operation is in-
dicated by the LED flashing ON and OFF at a rate of
one-second. A one-second ON followed by a one-sec-
ond OFF flash. This means there are no active flash
codes, faults or clock-outs. However there may be
faults recorded in the history buffer.
A flash rate of 250ms ON and OFF indicates a current
alarm is present. The alarm code number will also be
flashing on the four-digit character display. See
for a description of each of the alarm
codes.
If the LED is constantly ON (does not flash), the board
has failed and must be replaced. If the LED is OFF this
indicates no power to the board or a board failure. Two
flashes ON, then two-seconds OFF indicates the con-
trol is timing out on an Anti-Cycle-Delay (ASCD). To
bypass the ASCD timer depress the TEST/UP button 3
times within 5 seconds.
Alarm Codes
An active alarm is represented by a flashing alarm code
numeral. There are 43 alarms in all. Not all the alarms
are critical enough to shut down the system. Some
alarms flag the problem to bring it to the attention of
the operator or technician while allowing the system to
continue to operate.
The display flashes the current or most recent code and
contains the last five failures as well. To recall the last
five failures from the most recent to the oldest of the five,
press the “Alarm/Change” button once and each code is
displayed for two seconds. Each failure code is numbered
1 to 5 and the number is shown in the two-digit character
display located above the four-digit display.
The current and last five alarms can also be views un-
der the “ALARM” tab using the Simplicity PC soft-
ware.
A unit lockout can be reset in three ways:
•
Removing the 24VAC supply to the Unit
Controller.
•
Press the TEST/UP button twice in 5 seconds.
•
By a communicated command.
TABLE 46 -
ALARM CODE DESCRIPTIONS
ALARM
CODE
DESCRIPTION
01
Compressor System 1 (Compressors 1A, 1B) Locked Out On High Pressure Control. The Circuit Opened Three
Times Within A 2-Hour Window.
02
Compressor System 1 (Compressors 1A, 1B) Locked Out On High Pressure Control. The Circuit Opened Three
Times Within A 2-Hour Window.
03
Compressor System 2 (Compressors 2A, 2B) Locked Out On High Pressure Control. The Circuit Opened Three
Times Within A 2-Hour Window.
04
Compressor System 2 (Compressors 2A, 2B) Locked Out On High Pressure Control. The Circuit Opened Three
Times Within A 2-Hour Window.
05
Compressor System 1 (Compressors 1A, 1B) Locked Out On Low Pressure Control. The Circuit Opened Three
Times Within A 1-Hour Window.
06
Compressor System 1 (Compressors 1A, 1B) Locked Out On Low Pressure Control. The Circuit Opened Three
Times Within A 1-Hour Window.
07
Compressor System 2 (Compressors 2A, 2B) Locked Out On Low Pressure Control. The Circuit Opened Three
Times Within A 1-Hour Window.
08
Compressor System 2 (Compressors 2A, 2B) Locked Out On Low Pressure Control. The Circuit Opened Three
Times Within A 1-Hour Window.
09
Compressor System 1A Locked Out On Compressor Motor Protection Module. The Circuit Opened Three Times
Within A 1-Hour Window.
10
Compressor System 1B Locked Out On Compressor Motor Protection Module. The Circuit Opened Three Times
Within A 1-Hour Window.
11
Compressor System 2A Locked Out On Compressor Motor Protection Module. The Circuit Opened Three Times
Within A 1-Hour Window.
12
Compressor System 2B Locked Out On Compressor Motor Protection Module. The Circuit Opened Three Times
Within A 1-Hour Window.
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