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Home > Error Codes > Goodman
Every documented Goodman furnace error code with causes, fixes, and the parts you may need. Also covers: Amana, Daikin, Janitrol.
Steady ON
Control Board Failure
The LED is on continuously. The control board has an internal failure.
DIY check: Power cycle. If steady ON persists, replace the control board.
Common part needed: Shop Control Board →
Steady OFF
No Power
No power to the control board. No furnace operation possible.
DIY check: Check breaker, furnace switch, door switch, fuse on board, and transformer.
Common part needed: Shop Transformer →
1 Flash
Open Limit Switch / Flame Rollout
The high-temperature limit switch or flame rollout switch has opened due to overheating.
DIY check: Check air filter, supply registers, blower motor operation, and ductwork. If rollout switch tripped, have a tech inspect the heat exchanger before resetting.
Common part needed: Shop Fan Motor →
2 Flashes
Pressure Switch Stuck Open
The pressure switch did not close when the inducer started running.
DIY check: Check condensate drain, vent blockage, pressure hose, and inducer motor. Clear the condensate trap (most common fix on 90%+ units).
Common part needed: Shop Pressure Switch →
3 Flashes
Pressure Switch Stuck Closed
The pressure switch is closed before the inducer starts, or stayed closed when it should have opened.
DIY check: Check if the pressure switch is stuck mechanically. Tap it gently. Check the hose for water. If it persists, replace the pressure switch.
Common part needed: Shop Pressure Switch →
4 Flashes
Open Fuse / Open Limit
The board fuse has blown or a limit circuit is open. No 24V to thermostat.
DIY check: Check for short circuits in the thermostat wiring. Check the fuse on the board (3A or 5A glass fuse). Find and fix the short before replacing the fuse.
Common part needed: Shop Transformer →
5 Flashes
Flame Sensed Without Gas Valve
Flame is being detected when the gas valve is not energized. Potential gas leak or faulty sensor.
DIY check: Turn off the furnace and gas supply immediately. Call a technician. This is a potential safety issue.
Common part needed: Shop Gas Valve →
6 Flashes
115V Power Reversed / No Ground
Line voltage polarity is reversed or the ground connection is missing.
DIY check: Check the furnace power supply wiring for reversed hot and neutral. Verify the ground wire is connected.
7 Flashes
Gas Valve Error
The gas valve circuit has a fault. The board cannot properly control the gas valve.
DIY check: Check gas valve wiring connections. Test the gas valve coil resistance. If the valve clicks but gas does not flow, it may be stuck internally.
Common part needed: Shop Gas Valve →
8 Flashes
Low Flame Signal / Ignition Failure
The flame sensor signal is too low (below ~1 microamp) or the furnace failed to ignite properly.
DIY check: Clean the flame sensor with emery cloth. Check the sensor wire. Verify gas supply is on and gas pressure is correct. Check the igniter for cracks.
Common part needed: Shop Flame Sensor →
9 Flashes
Ignition Lockout
The furnace has failed to ignite after the maximum number of attempts and is locked out. Requires a power cycle to reset.
DIY check: Power cycle to reset. Then check: gas supply on, igniter glowing (if not, replace igniter), flame sensor clean, gas valve opening (listen for click).
Common part needed: Shop Igniter →
10 Flashes
Blower Motor / Calibration Error
The blower motor is not running at the expected speed or has failed to start.
DIY check: Check the blower motor, capacitor, and wiring. On ECM motors, check the motor module for its own diagnostic codes.
Common part needed: Shop Fan Motor →
Rapid Flash
Line Voltage AC Brownout
The incoming 115VAC power dropped below acceptable levels during operation.
DIY check: Check for loose connections in the power supply. The issue may be external (utility brownout, shared circuit with large appliance). Try a dedicated circuit.
If the same code keeps coming back after you have addressed the obvious cause (dirty filter, flame sensor, etc.), or if you smell gas, see burn marks, or the furnace will not come out of lockout after a power cycle, call a licensed HVAC technician. Electrical and gas work carries real safety risk.