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Configuring Unit Size Codes
Power−up − Unit Size Code number displayed represents unit size code (furnace model size
and capacity). If three horizontal bars are display followed by continuous E203, Furnace
control does not recognize unit size code (furnace model size and capacity).
Furnace control in IDLE mode
(Decimal point blinking. 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, then 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 to allow furnace control
to display unit size code number for each
different furnace model for five seconds.
When the correct unit sized 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).
Furnace 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, configuring
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 IFC, 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
G71MPP−36B−070
G71MPP−36C−090
G71MPP−60C−090
G71MPP−60C−110
G71MPP−60D−135
UNIT SIZE
CODE
0
1
2
3
4
−
−
−
_
_
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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