Goodman Furnaces Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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1 FLASH
Furnace will not start; LED shows 1 flash, repeating; inducer motor does not run.
Ignition Failure – Lockout
2 FLASHES
Furnace attempts to start but shuts down quickly; LED shows 2 flashes, repeating; inducer may start then stop.
Pressure Switch Stuck Closed
3 FLASHES
Furnace starts inducer but does not ignite; LED shows 3 flashes. You may hear the ignitor, but no flame is present.
Pressure Switch Stuck Open or Failed to Close
4 FLASHES
Furnace lights but shuts off quickly; LED shows 4 flashes. Burners may cycle on and off repeatedly.
Open High Limit Switch or Limit Circuit
5 FLASHES
Furnace will not run; LED shows 5 flashes. The blower may run continuously.
Flame Sensed with Gas Valve Off (False Flame Signal)
6 FLASHES
Furnace will not start; LED shows 6 flashes. The inducer may run briefly, then stop.
Pressure Switch Cycle Lockout or Venting Problem
7 FLASHES
Furnace shuts down; LED shows 7 flashes. The blower may continue to run.
Flame Loss During Run
8 FLASHES
Furnace will not start; LED shows 8 flashes. The thermostat appears to call for heat, but nothing happens.
Low or No 115 VAC Power to Furnace / Polarity or Ground Fault
9 FLASHES
Furnace will not run; LED shows 9 flashes. The blower may run at low speed.
Reversed Line Polarity or Ground Fault
BLOWER ONLY / NO LED
The blower runs continuously, but the LED is off or very dim; no heat.
Control Board Power Loss or Internal Failure
CONTINUOUS SLOW FLASH
Furnace does not respond to the thermostat; LED shows a slow, continuous flash with no distinct count.
No Call for Heat / Normal Standby
LOCKOUT – 3 FAILED IGNITIONS
The furnace attempts to light three times then stops; the LED indicates an ignition lockout; the blower may run for a purge cycle.
Ignition Retry Lockout
LOCKOUT – FLAME SENSE FAILURE
Burners light briefly then shut off; the furnace retries several times then locks out; the LED indicates a flame sense error.
Flame Rectification Failure
OPEN AUX LIMIT
The furnace starts but shuts down before reaching temperature; the LED indicates an auxiliary limit is open; the blower may continue to run.
Auxiliary Limit Switch Open (Typically in Blower or Vestibule Area)
OPEN ROLLOUT SWITCH
Furnace shuts down quickly after an ignition attempt; the LED may show a rollout-related code; the manual reset rollout switch is tripped.
Flame Rollout / Rollout Switch Open
STEADY ON
LED is on solid with no flashing; the furnace may or may not be operating.
Normal Operation or Board Powered with No Fault
Symptom
Furnace blower is very loud or rattling; vibration felt in ducts and floor.
Blower Wheel Imbalance or Loose Mounting
Symptom
Furnace cycles on and off frequently (every few minutes) without reaching set temperature.
Short Cycling
Symptom
Furnace ignites but produces yellow, lazy flames or soot around the burner area.
Improper Combustion / Incomplete Burning
Symptom
Furnace is very noisy in the ductwork with whistling or rumbling sounds when running.
Duct Resonance or High Static Pressure
Symptom
Furnace occasionally shuts off and then restarts on its own; lights flicker when it happens.
Intermittent Power Interruption
Symptom
Furnace occasionally trips the household circuit breaker.
Overcurrent or Short Circuit in Furnace
Symptom
Furnace produces a high-pitched whine or loud humming from the inducer area.
Inducer Motor Bearing Wear or Obstruction
Symptom
Furnace runs but some rooms are cold while others are warm.
Uneven Heating / Duct Imbalance
Symptom
Furnace runs but there is a burning dust or metallic smell when heat first comes on.
Dust Burn-Off or Overheating Components
Symptom
Furnace starts but shuts off after a few seconds; inducer and blower may continue to run.
Flame Proving Failure or Rollout/Limit Trip
Symptom
The blower runs continuously even when the thermostat is not calling for heat or fan.
Blower Stuck in Fan-On Mode
Symptom
The furnace makes a loud banging or booming noise at startup when burners ignite.
Delayed Ignition
Symptom
The furnace runs but does not keep the house warm; supply air is only slightly warm, and burners cycle frequently.
Underfiring or Short Cycling
Symptom
The furnace starts and runs but shuts off on high limit; you hear the blower running hard, and ducts may be noisy.
Overheating / High Static Pressure
Symptom
The furnace will not start at all; there is no blower, no inducer, and no LED lights.
No Power to Furnace
Symptom
The inducer motor runs but the burners never light; you do not see the hot surface ignitor glowing.
Ignitor Not Energizing
Symptom
Thermostat calls for heat but outdoor AC condensing unit also runs when furnace is on (in heating mode).
Miswired Thermostat or Control Board
Symptom
Thermostat is blank and furnace does not respond.
Loss of 24V Control Power
Symptom
Water leaking around the base of a high-efficiency Goodman furnace.
Condensate Leak
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| 1 FLASH |
Furnace will not start; LED shows 1 flash, repeating; inducer motor does not run.
|
Ignition Failure – Lockout | View Details |
| 2 FLASHES |
Furnace attempts to start but shuts down quickly; LED shows 2 flashes, repeating; inducer may start then stop.
|
Pressure Switch Stuck Closed | View Details |
| 3 FLASHES |
Furnace starts inducer but does not ignite; LED shows 3 flashes. You may hear the ignitor, but no flame is present.
|
Pressure Switch Stuck Open or Failed to Close | View Details |
| 4 FLASHES |
Furnace lights but shuts off quickly; LED shows 4 flashes. Burners may cycle on and off repeatedly.
|
Open High Limit Switch or Limit Circuit | View Details |
| 5 FLASHES |
Furnace will not run; LED shows 5 flashes. The blower may run continuously.
|
Flame Sensed with Gas Valve Off (False Flame Signal) | View Details |
| 6 FLASHES |
Furnace will not start; LED shows 6 flashes. The inducer may run briefly, then stop.
|
Pressure Switch Cycle Lockout or Venting Problem | View Details |
| 7 FLASHES |
Furnace shuts down; LED shows 7 flashes. The blower may continue to run.
|
Flame Loss During Run | View Details |
| 8 FLASHES |
Furnace will not start; LED shows 8 flashes. The thermostat appears to call for heat, but nothing happens.
|
Low or No 115 VAC Power to Furnace / Polarity or Ground Fault | View Details |
| 9 FLASHES |
Furnace will not run; LED shows 9 flashes. The blower may run at low speed.
|
Reversed Line Polarity or Ground Fault | View Details |
| BLOWER ONLY / NO LED |
The blower runs continuously, but the LED is off or very dim; no heat.
|
Control Board Power Loss or Internal Failure | View Details |
| CONTINUOUS SLOW FLASH |
Furnace does not respond to the thermostat; LED shows a slow, continuous flash with no distinct count.
|
No Call for Heat / Normal Standby | View Details |
| LOCKOUT – 3 FAILED IGNITIONS |
The furnace attempts to light three times then stops; the LED indicates an ignition lockout; the blower may run for a purge cycle.
|
Ignition Retry Lockout | View Details |
| LOCKOUT – FLAME SENSE FAILURE |
Burners light briefly then shut off; the furnace retries several times then locks out; the LED indicates a flame sense error.
|
Flame Rectification Failure | View Details |
| OPEN AUX LIMIT |
The furnace starts but shuts down before reaching temperature; the LED indicates an auxiliary limit is open; the blower may continue to run.
|
Auxiliary Limit Switch Open (Typically in Blower or Vestibule Area) | View Details |
| OPEN ROLLOUT SWITCH |
Furnace shuts down quickly after an ignition attempt; the LED may show a rollout-related code; the manual reset rollout switch is tripped.
|
Flame Rollout / Rollout Switch Open | View Details |
| STEADY ON |
LED is on solid with no flashing; the furnace may or may not be operating.
|
Normal Operation or Board Powered with No Fault | View Details |
| – |
Furnace blower is very loud or rattling; vibration felt in ducts and floor.
|
Blower Wheel Imbalance or Loose Mounting | View Details |
| – |
Furnace cycles on and off frequently (every few minutes) without reaching set temperature.
|
Short Cycling | View Details |
| – |
Furnace ignites but produces yellow, lazy flames or soot around the burner area.
|
Improper Combustion / Incomplete Burning | View Details |
| – |
Furnace is very noisy in the ductwork with whistling or rumbling sounds when running.
|
Duct Resonance or High Static Pressure | View Details |
| – |
Furnace occasionally shuts off and then restarts on its own; lights flicker when it happens.
|
Intermittent Power Interruption | View Details |
| – |
Furnace occasionally trips the household circuit breaker.
|
Overcurrent or Short Circuit in Furnace | View Details |
| – |
Furnace produces a high-pitched whine or loud humming from the inducer area.
|
Inducer Motor Bearing Wear or Obstruction | View Details |
| – |
Furnace runs but some rooms are cold while others are warm.
|
Uneven Heating / Duct Imbalance | View Details |
| – |
Furnace runs but there is a burning dust or metallic smell when heat first comes on.
|
Dust Burn-Off or Overheating Components | View Details |
| – |
Furnace starts but shuts off after a few seconds; inducer and blower may continue to run.
|
Flame Proving Failure or Rollout/Limit Trip | View Details |
| – |
The blower runs continuously even when the thermostat is not calling for heat or fan.
|
Blower Stuck in Fan-On Mode | View Details |
| – |
The furnace makes a loud banging or booming noise at startup when burners ignite.
|
Delayed Ignition | View Details |
| – |
The furnace runs but does not keep the house warm; supply air is only slightly warm, and burners cycle frequently.
|
Underfiring or Short Cycling | View Details |
| – |
The furnace starts and runs but shuts off on high limit; you hear the blower running hard, and ducts may be noisy.
|
Overheating / High Static Pressure | View Details |
| – |
The furnace will not start at all; there is no blower, no inducer, and no LED lights.
|
No Power to Furnace | View Details |
| – |
The inducer motor runs but the burners never light; you do not see the hot surface ignitor glowing.
|
Ignitor Not Energizing | View Details |
| – |
Thermostat calls for heat but outdoor AC condensing unit also runs when furnace is on (in heating mode).
|
Miswired Thermostat or Control Board | View Details |
| – |
Thermostat is blank and furnace does not respond.
|
Loss of 24V Control Power | View Details |
| – |
Water leaking around the base of a high-efficiency Goodman furnace.
|
Condensate Leak | View Details |
No matching codes found
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