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See "Electrostatic Discharge (ESD)" before touching any
electronic part on this furnace.
Furnace Fails to Operate Properly
Review "Sequence of Operation" and visually inspect the
following before troubleshooting:
WARNING
HIGH VOLTAGE!
Goodman 6
Disconnect ALL power before servicing.
Multiple power sources may be present.
Failure to do so may cause property damage,
personal injury or death.
Is the integrated ignition/blower control board and power to
the furnace on?
Problem
Furnace fails to operate
Integrated control module
diagnostic LED provides
no signal
LED is steady On.
Furnace fails to operate.
Integrated control module
diagnostic LED is flashing
1 flash.
Furnace fails to operate.
Integrated control module
diagnostic LED is flashing
2 flashes.
TROUBLESHOOTING
LED Code
Fault/Cause
None
No 115-volt power to furnace, or no
24-volt power to integrated control
module.
Blown fuse or circuit breaker.
Internal fault in integrated control
module.
Continuous
Normal operation
On—not
flashing
1 flash
Furnace lockout due to an excessive
number of ignition "retries" (3 total).
Failure to establish flame. Cause may
be no gas to burners, front cover
pressure switch stuck open, bad igniter
or igniter alignment, improper orifices
or coated/oxidized or improperly
connected flame sensor.
Loss of flame after establishment.
Cause may be interrupted gas supply,
lazy burner flames (improper gas
pressure or restriction in flue and/or
combustion air piping), front cover
pressure switch opening or improper
induced draft blower performance.
2 flashes
Pressure switch circuit is closed.
Induced draft blower is not operating.
Induced draft blower pressure switch
contacts sticking.
Shorts in pressure switch circuit.
Is the blower compartment door securely closed?
Are the manual shutoff valves in the gas line to the furnace
open?
Are all wiring connections secure?
Start the system by setting thermostat above room temperature.
Observe system response. Then use the information provided in
this section to check the system operation.
Fault Recall
The ignition control is equipped with a momentary push button
switch that can be used to display on the diagnostic LED the last
5 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 5 detected faults. The
order of display is the most recent fault to the least recent fault.
Solution
Check that there is 115-volt power to the
furnace, or 24-volt power to integrated
control module.
Check integrated control module fuse
(3A). Replace if necessary.
Check for possible shorts in 115-volt and
24-volt circuits. Repair as necessary.
Replace bad integrated control module.
None
Locate and correct gas interruption.
Check front cover pressure switch
operation (hose, wiring, contact
operation). Correct if necessary.
Replace or realign igniter. Igniter is fragile,
handle gently.
Check flame sensor signal. Sand sensor
with emery cloth if coated and/or
oxidized.
Check flue piping for blockage, proper
length, elbows and termination. See
"Vent/Flue Pipe."
Verify proper induced draft blower
performance.
Replace induced draft blower pressure
switch.
Repair short.
39
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