5188235-YIM-E-0518
64 Johnson Controls Ducted Systems
The pilot burner lights and the spark stops but the main burners
do not light.
1. Check electrical connections between the ignition control
and the gas valve. If intact, check for 24 volts across
terminals “MV” and “GROUND” terminals. If no voltage
detected, replace ignition control. If voltage is present,
replace gas valve.
Main burners light but exhibit erratic flame characteristics.
1. Adjust air shutters as described in “BURNER AIR
SHUTTER ADJUSTMENT” on page 55.
2. Check the main burner orifices for obstruction and
alignment. Removal procedure is described in BURNER
INSTRUCTIONS on page 55. Clean or replace burner
orifices and burners as needed.
Simplicity Lite Unit Flash Codes
Various flash codes are utilized by the Simplicity Lite 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
Simplicity Lite 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.
Figure 28: Simplicity Lite Control Board
Table 29: Simplicity Lite 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
Control Board
LED
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