290699-YIM-B-0607
Unitary Products Group
55
UCB and the ICB are functioning correctly. Do not con-
fuse this with an error flash code. To prevent confu-
sion, a 1-flash, flash code is not used.
Current alarms or active restrictions are flashed on the
UCB LED. Pressing and releasing the ALARMS 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 approxi-
mately 2 seconds.
Current alarms or active restrictions are flashed on the
ICB LED. No history is stored on the ICB.
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 button once.
TABLE 32: UNIT CONTROL BOARD FLASH
CODES
Flash Code
Description
On Steady
Control Failure - Replace Control
Heart Beat
Normal Operation
1 Flash
Not Applicable
2 Flashes
Control waiting ASCD
1
1.
These flash codes do not represent alarms.
3 Flashes
HPS1 - Compressor Lock out
5 Flashes
LPS1 - Compressor Lock out
7 Flashes
FS1 - Compressor Lock out
9 Flashes
Ignition Control Locked Out/
Ignition Control Failure / Limit Switch Trip / No
Jumper Plug in Heat Section
10 Flashes
Compressors Locked Out On Low
Outdoor Air Temperature
11 Flashes
Compressors Locked Out Because The
Economizer Is Using Free Cooling
13 Flashes
Compressor Held Off Due To Low Voltage
14 Flashes
EEPROM Storage Failure (Control Failure)
OFF
No Power or Control Failure
TABLE 33: IGNITION CONTROL BOARD FLASH
CODES
Flash Code
Description
Heart Beat
Normal Operation
1 Flash
Not Applicable
2 Flashes
Pressure / Centrifugal Switch Open with Inducer On
3 Flashes
Pressure / Centrifugal Switch Closed with Inducer Off
4 Flashes
Not Applicable
5 Flashes
Lock Out From Too Many Flame Losses
6 Flashes
High Temperature Switch Open (Primary or Aux.)
7 Flashes
Rollout Switch Open
8 Flashes
Flame Present With Gas OFF
9 Flashes
Gas Valve Stuck Off or On
10 Flashes
Flame Sense Circuit Failure
