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178113-BIM-D-0906
alarm condition but due to the space constraints of the UCB,
will be indicated by the Red LED. In all other cases, a flashing
Green LED will be used to indicate non-alarm conditions.
In some cases, it may be necessary to "zero" the ASCD for the
compressors in order to perform troubleshooting. To reset all
Table 24: Unit Control Board Flash Codes
Flash
Codes
On Steady
1 Flash
2 Flashes
3 Flashes
4 Flashes
5 Flashes
6 Flashes
7 Flashes
8 Flashes
9 Flashes
Ignition Control Locked Out / Ignition Control Failure
10 Flashes
Compressors Locked Out on Low Outdoor Air Temperature
11 Flashes
Compressors locked out because the Economizer is using free Cooling
12 Flashes
Unit Locked Out due to Fan Overload Switch Failure
13 Flashes
14 Flashes
15 Flashes
16 Flashes
17 Flashes
18 Flashes
19 Flashes
20 Flashes
21 Flashes
OFF
1. Non-alarm conditions.
Check
Alarm
History
Reset All ASCDs
For One Cycle
Non Alarm Condition
Green LED Flashing
Current Alarm
Flashed Red LED
Figure 30: Unit Control Board
Unitary Products Group
Description
This is a Control Failure
Not Applicable
Control waiting ASCD
HPS1 Compressor Lockout
HPS2 Compressor Lockout
LPS1 Compressor Lockout
LPS2 Compressor Lockout
FS1 Compressor Lockout
FS2 Compressor Lockout
Compressor Held Off due to Low Voltage
EEPROM Storage Failure
HPS3 Compressor Lockout
HPS4 Compressor Lockout
LPS3 Compressor Lockout
LPS4 Compressor Lockout
FS3 Compressor Lockout
FS4 Compressor Lockout
Compressor Off due to Low SAT
No Power or Control Failure
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 24.
Green
LED 16
1
Flashing
1
Flashing
1
Flashing
1
Flashing
1
Red
Red
LED 8
LED 4
-
-
-
-
-
-
Off
Off
Off
Off
Off
Off
Off
On
Off
Off
On
Off
Off
On
Off
Off
On
Off
On
Off
Off
On
Off
On
Off
On
Off
Off
On
On
On
On
Off
On
On
Off
On
On
On
Off
Off
On
Off
Off
On
Off
Off
On
Off
Off
On
Off
On
On
Off
On
Off
Off
Off
Red
Red
Led 2
LED 1
-
-
-
-
On
Off
On
On
Off
Off
Off
On
On
Off
On
On
Off
Off
Off
On
On
Off
On
On
Off
Off
Off
On
On
Off
On
On
Off
Off
Off
On
On
Off
On
On
Off
Off
Off
On
Off
Off
55
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