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175244-BIM-A-0706
64
Unitary Products Group
of flashes, and is shown in the table. Pressing and
releasing the LAST ERROR button on the UCB can
check the alarm history. The UCB will cycle through the
last five (5) alarms, most recent to oldest, separating
each alarm flash code by approximately 2 seconds. In
all cases, a flashing Green LED will be used to indicate
non-alarm condition.
In some cases, it may be necessary to "zero" the
ASCD for the compressors in order to perform trouble-
shooting. To reset all ASCDs for one cycle, press and
release the UCB TEST/ RESET button once.
Flash codes that do and do not represent alarms are
listed in Table 35.
TABLE 35: UNIT CONTROL BOARD FLASH CODES
FLASH CODE
DESCRIPTION
GREEN
LED
16
RED
LED
8
RED
LED
4
RED
LED
2
RED
LED
1
On Steady
This is a Control Failure
-
-
-
-
-
1 Flash
Not Applicable
-
-
-
-
-
2 Flashes
Control waiting ASCD
1
1.
Non-alarm condition.
Flashing
Off
Off
On
Off
3 Flashes
HPS1 Compressor Lockout
Off
Off
Off
On
On
4 Flashes
HPS2 Compressor Lockout
Off
Off
On
Off
Off
5 Flashes
LPS1 Compressor Lockout
Off
Off
On
Off
On
6 Flashes
LPS2 Compressor Lockout
Off
Off
On
On
Off
7 Flashes
FS1 Compressor Lockout
Off
Off
On
On
On
8 Flashes
FS2 Compressor Lockout
Off
On
Off
Off
Off
9 Flashes
Ignition Control Locked Out / Ignition Control Failure
Off
On
Off
Off
On
10 Flashes
Compressors Locked Out on Low Outdoor Air Temperature
1
Flashing
On
Off
On
Off
11 Flashes
Compressors locked out because the Economizer is using free
Cooling
1
Flashing
On
Off
On
On
12 Flashes
Unit Locked Out due to Fan Overload Switch Failure
Off
On
On
Off
Off
13 Flashes
Compressor Held Off due to Low Voltage
1
Flashing
On
On
Off
On
14 Flashes
EEPROM Storage Failure
Off
On
On
On
Off
OFF
No Power or Control Failure
Off
Off
Off
Off
Off
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