Goodman MEC96 Series Instruction Manual page 52

Fault Code Reset
To clear the fault code memory, push and hold the "LAST
ERROR" button for more than 5 seconds and less than 10
seconds (the LED will indicate this period by RAPID GREEN
FLASH for 5 seconds to 10 seconds). The LED will flash three
green flashes when the memory has been cleared.
The ignition control is equipped with a momentary push
button switch that can be used to display on the diagnostic
LED the last five faults detected by the control. The control
must be in Standby Mode (no thermostat inputs) to use the
feature. Depress the push button switch for approximately 2
seconds. Release the switch when the LED is turned off. The
diagnostic LED will then display the flash codes associated
with the last five detected faults. The order of display is the
most recent fault to the least recent fault.
Resetting From Lockout
Furnace lockout results when a furnace is unable to achieve
ignition after three attempts during a single call for heat. It is
characterized by a non-functioning furnace and a one flash
diagnostic LED code. If the furnace is in "lockout", it can be
reset in any of the following ways.
1. Automatic reset. The integrated control module will
automatically reset itself and attempt to resume normal
operations following a one hour lockout period.
2. Manual power interruption. Interrupt 115 volt power to
the furnace for 1 - 20 seconds.
3. Manual thermostat cycle. Lower the thermostat so that
there is no longer a call for heat then reset to previous
setting. Interrupt thermostat signal to the furnace for
1 - 20 seconds.
NOTE: If the condition which originally caused the lockout
still exists, the control will return to lockout. Refer to the
Troubleshooting Chart for aid in determining the cause.
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