Subject to change without notice. Printed in U.S.A. 689670-BIM-A-0311
Copyright © 2011 by Johnson Controls, Inc. All rights reserved. Supersedes: 527728-BIM-D-1210
Johnson Controls Unitary Products
5005 York Drive
Norman, OK 73069
Table 27: 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 28: Ignition Control Flash Codes
Flashes Fault Conditions Check
Steady On Control Failure Control
Heartbeat Normal Operation
1 Not Applicable
2
Pressure Switch
Stuck Closed
Pressure Switch
3
Pressure Switch Failed
To Close
Venter Pressure
Switch
Vent Blocked
4 Limit Switch Open
Main Limit
AUX Limit
5
Flame Present With Gas
Off First Stage Gas Valve
Energized With W1 Off
Second Stage Gas Valve
Energized With First
Stage
Gas Valve Off
Gas Valve
6 Ignition Lockout
Gas Flow
Gas Pressure
Gas Valve
Flame Sensor
Steady Off
No Power Or Control
Failure
24VAC or Control
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