5188235-YIM-B-1016
66
Johnson Controls Unitary Products
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 58.
2.
Check the main burner orifices for obstruction and
alignment. Removal procedure is described in BURNER
INSTRUCTIONS on page 57. Clean or replace burner
orifices and burners as needed.
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 30: Simplicity Lite Control Board
Table 30: 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 31: 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
