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Integrated Control Diagnostic Codes
Code Diagnostic Codes/Status of Equipment Action Required to Clear and Recover
E402
LSOM - Outdoor unit system pressure trip. Compressor ran over 18 hours in air conditioning mode.
E403
LSOM - Compressor short-cycling (Running less than
4 minutes).
Outdoor unit pressure trip. Check dirty coil, fan motor,
refrigerant charge.
E404
LSOM - Compressor rotor locked. Compressor short cycling (Running less than 4 minutes).
E405
LSOM - Compressor open circuit. Check capacitor, wiring, hard start kit , replace
Compressor.
E406
LSOM - Compressor open start circuit. Check compressor for hot (cool down) , check pressures,
fan motor etc. Replace compressor if unable to get circuit
to close and compressor to operate.
E407
LSOM - Compressor open run circuit.
E408
LSOM - Compressor contactor is welded.
E409
LSOM - Compressor contactor is welded. Replace contactor.
Conguring Unit Size Codes
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 Field Test
Mode: push and hold
button next to
7-segment LED display
until solid dash symbol
appears. Release
button.
Turn room thermostat to OFF
Push and hold button until the solid P
symbol is displayed on the 7-segment
LED. Release button. This mode allows
the user to select a unit size code number
that matches the furnace model size and
capacity.
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 five seconds.
When the correct unit size code is displayed, release
button. Selected code will flash for 10-second period.
During that period, hold push button until code stops
blinking (disappear for 2 seconds). Integrated control
will store code in memory and will automatically exit
Field Test Mode and reset. (If second period expires
or push button is held less than five seconds, control
will automatically exit Field Test 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
SLP99UHXV-070-36B
SLP99UHXV-090-36C
SLP99UHXV-090-48C
SLP99UHXV-090-60C
SLP99UHXV-110-60C
SLP99UHXV-135-60D
UNIT SIZE
CODE
A
b
C
d
E
F
−
−
−
_
_
P
P
−
−
−
If alarm is present, furnace
control will display error
code. If alarm is not
present solid dash starts
blinking on 7-segment
LED display.
FINISHED
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