Subject to change without notice. Printed in U.S.A. 697890-YIM-C-0213
Copyright © 2013 by Johnson Controls, Inc. All rights reserved. Supersedes: 697890-YIM-B-0212
Johnson Controls Unitary Products
5005 York Drive
Norman, OK 73069
Unit Flash Codes
Various flash codes are utilized by the unit control board (UCB)
and the ignition control board (ICB) to aid in troubleshooting.
Flash codes are distinguished by the short on and off cycle
used (approximately 200ms on and 200ms off). To show normal
operation, the control boards flashes a 1 second on, 1 second
off “heartbeat” during normal operation. This is to verify that the
UCB and the ICB are functioning correctly. Do not confuse this
with an error flash code. To prevent confusion, a 1-flash, flash
code is not used.
Current alarms or active restrictions are flashed on the UCB
LED.
• LAST ERROR - When this button is pressed and released
one time within five seconds, it flashes the last five flash
codes on the board’s LED. The most recent alarm is
shown first and the oldest alarm is shown last.
When pressed and released twice within a five second
span, the fault history is cleared.
• TEST RESET - When this button is pressed and released
one time within five seconds, any anti-short cycle delays
(ASCD) is by-passed for one cycle.
When this button is pressed twice within five seconds, any
active lockouts are reset.
• COMM SET UP - If the board is to be networked with
other units, this button is used to set the network address.
The first time the button is pressed within five seconds, it
scans the bus, then assigns itself the first available
address {starts at 2}. It then flashes that address one time.
Pressing the button two times within five seconds causes
the control to flash its address.
Pressing the button three times within five seconds forces
the control to reset its address to 1, which is the factory
default.
Fan On And Off Delays
The fan ON and OFF delays can be field adjusted by pressing a
combination of buttons on the UCB.
• Gas Heat Option #1 - Press the LAST ERROR and
TEST RESET buttons simultaneously and then release.
The control flashes three times as it writes a 30 second
delay ON and a 90 second delay OFF to the program.
• Gas Heat Option #2 - Press the COMM SETUP and
TEST RESET buttons simultaneously and then release.
The control flashes four times as it writes a 30 second
delay ON and a 180 second delay OFF to the program.
• Electric Heat - Press and release the COMM SETUP and
LAST ERROR buttons at the same time. The control
flashes twice on the LED as the control writes a 0 second
ON and a 30 second OFF fan delay to the control’s
program memory.
Figure 27: Unit Control Board
Table 29: 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
1
11 Flashes
Compressors Locked Out Because The
Economizer Is Using Free Cooling
1
13 Flashes Compressor Held Off Due To Low Voltage
1
14 Flashes EEPROM Storage Failure (Control Failure)
OFF No Power or Control Failure
Table 30: 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
Comm Setup
Button
Last Error
Button
Test Reset
Button
ontrol Board
LED
To Previous Page
Loading...
