ICM
280
GOODMAN REPLACEMENT BOARD
LII318-2
800-365-5525
www.icmcontrols.com
ICM CONTROLS
7313 William Barry Blvd.
North Syracuse, NY 13212
Timing Chart
NOTES
• If the jumper is removed, the control will default to a 150 second blower off
delay in the heating mode
• CAUTION is to be exercised not to bend the metal pins when changing the
time delay from the factory settings
ON Delay OFF Delay
Heat
30 Seconds 90 Seconds
120 Seconds
150 Seconds (Default)
Cool 7 Seconds 60 Seconds
LED ON: No fault
OFF: Gas valve fault detected
# of LED Flashes Represents
1
Ignition failure (after 3 tries and start of soft lockout)
2
Pressure switch stuck closed
3
Pressure switch failed to close
4
Limit switch failed open
5
Flame present with gas valve output off
6
Brownout voltage
7
Fault twinning
Rapid Flashing
Wrong polarity of 120 VAC and Neutral
Status LEDs
NOTE: DISCONNECT ALL ELECTRICAL POWER AND SHUT OFF GAS TO THE FURNACE BEFORE PROCEEDING
CAUTION! Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation.
Verify proper operation after servicing.
REPLACEMENT of B18099-06, B18099-08 and B18099-10 HSI Module with an ICM280 Board
• Remove both access panels.
• Cut the white jumper wire between pins 1 and 4 of the 9-pin connector for
GMP and GMPV series units
• Do not cut the white jumper wire for GMPN and GMN series units.
• Remove the edgecard connector and other wires from the existing module
and discard the thermostat wires removed from the board (R, W, and G).
• Remove existing HSI module. Note: Do not damage the nylon standoffs.
• Install the ICM280.
• Reconnect the edgecard connector ensuring good contact.
• Push the 9-pin connector into the ICM280. Note: It can only go one way. Do
not force it.
• Reconnect the supplied thermostat wires.
• Remove the red wire from the 24-volt side of the transformer’s secondary
side. Discard it.
• Remove the blue ground wire from the transformer, but do not discard it.
• Remove the blue wire from the transformer. Discard it.
• Place the red wire from the 9-pin connector onto 24-volt (hot) of the
secondary side of the transformer.
• Place the blue wire from the 9-pin connector onto common terminal of the
secondary side of the transformer. This wire has a piggy back terminal.
• Place the blue ground wire, which was previously removed, onto the
common terminal of the transformer.
• Replace both access panel.
• Restore gas and electrical power to the furnace.
• Verify the sequence of operation.
REPLACEMENT of B18099-13 HSI Module with an ICM280 Board
• Remove both access panels.
• Locate the red, white and green thermostat wires (pigtails) where they pass
through the side of the furnance cabinet. Remove and save the wire nuts
and then disconnect the pigtails from the main thermostat wire assembly.
• Disconnect all wires from the HSI module
• Discard the thermostat wires (pigtails) removed from the board (terminals R,
W, and G).
• Remove the existing HSI module from the control panel. Do not damage the
nylon standoffs.
• Carefully remove the standoffs and insert them into the same locations on
the ICM280.
• Install the ICM280.
• Reconnect the 9-pin connector into the ICM280. Note: It can only go
one way. Do not force it.
• Route the red, white and green thermostat wires (pigtails) supplied
with the ICM280 through the side of the cabinet and then, using the
wire nuts saved earlier, reconnect them to the main thermostat wire.
• Reconnect all other wires to the controls module being careful to
match the wire labels to the thermostat connections.
NOTE: For GMT, GDT, GMTH and GMNT units, disregard the 9-pin connector supplied with the ICM280.
In the heating mode, the blower off delay can be used to obtain a 90, 120,
or 150 second period by changing the position of the plastic jumper on the
ignition control. See drawing below for location of this jumper
Selecting the Blower Off Delay
The control is factory set to give a 150
second blower off delay.
W
G
R
STATUS
TWIN
HEAT
DELAY
120
90
150
24V HUM
TEST
Blower Time O
Jumper
(26 pages)
(52 pages)
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