284809-YIM-B-0707
64 Unitary Products Group
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 27.
TABLE 27: 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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