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Integrated Control Diagnostic Modes
Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover
E406 LSOM - Compressor open start circuit. Required amount of current is not passing through Start cur-
rent transformer. Clears the error after current is sensed in
START sensor, or after power reset.
E407 LSOM - Compressor open run circuit. Required amount of current is not passing through Run current
transformer. Clears the error after current is sensed in RUN
sensor, or 1 normal compressor run cycle, or after power reset.
E408 LSOM - Compressor contactor is welded. Compressor runs continuously. Clears the error after 1 normal
compressor run cycle or after power reset.
E409 LSOM - Compressor low voltage. Secondary voltage is below 18VAC. After 10 minutes, oper-
ation is discontinued. Clears the code after voltage is higher
than 20 VAC for 2 seconds or after power reset.
Program Unit Capacity / Size Mode
Power-Up - Number displayed represents by integrated control unit size code (furnace model
and capacity). If three horizontal bars are displayed followed by continuous E203, furnace
control does not recognize unit size code. Configure per the following:
Furnace control in IDLE mode
No heating, cooling or indoor fan
operation)
To enter Program Unit
Capacity/Size: push
and hold button next to
7-segment LED display
until solid “P” symbol
appears. Release
button.
Turn room thermostat to OFF
Solid P starts
blinking on
7-Segment LED
Push and hold button. Integrated control will
display unit size code number for each
furnace model for three seconds.
When the correct unit size code is displayed, release
button. Selected code will flash for 10-second period.
During that period, press and hold push button for 5
seconds. Integrated control will store code in
memory and will automatically exit Program Unit
Capacity/Size Mode and reset. (If second period
expires or push button is held less than five seconds,
control will automatically exit Program
Capacity/Size Mode and go into IDLE mode without
storing unit size code. If this happens, programming
function must be repeated).
Verify that the selected unit size code is correct
and stored in non-volatile memory by cycling
the 24 volt power to the furnace control. (At 24
volt power-up of the furnace control, the
7-segment LED will display a unit size code
. If
three horizontal bars display, board does not
recognize unit size code
. Programming
function must be repeated)
Yes
No
IMPORTANT: Field replacement controls may
need to be manually configured to validate
furnace unit size code.
FURNACE MODEL
SL280UH070V36A
SL280UH090V36B
SL280UH090V48B
SL280UH090V60C
SL280UH110V60C
SL280UH135V60D
UNIT SIZE
CODE
A
b
C
d
E
F
−
−
−
_
P
−
−
−
FINISHED
FURNACE MODEL
SL280DF070V36A
SL280DF090V48B
SL280DF090V60C
SL280DF110V60C
UNIT SIZE
CODE
H
J
L
n
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