Goodman/Amana Furnace Fault Codes Guide
Goodman and Amana furnaces are built on the same platform — Goodman Manufacturing produces both brands, so their control boards and fault code systems are identical. Whether you own a Goodman GMVC96, GMSS96, Amana AMVC96, or another model in these families, this guide will help you interpret the LED flash codes on the control board and decide on your next step.
How to Read Goodman/Amana Flash Codes
The status LED on Goodman and Amana furnaces is located on the main control board inside the blower compartment. It blinks a set of flashes, pauses, then blinks again. The number of flashes in the first set is the primary code; the second set is the secondary code (on some models). A label inside the furnace door lists the fault descriptions for your specific model. On ComfortNet communicating systems, codes appear on the connected thermostat display.
Common Goodman/Amana Furnace Fault Codes
| Flash Code | Meaning | What to Do |
|---|---|---|
| 1 flash | System lockout — ignition failure (3 tries) | Check gas supply; one reset allowed |
| 2 flashes | Pressure switch stuck open | Check vent blockage and condensate drain |
| 3 flashes | Pressure switch stuck closed | Technician required |
| 4 flashes | Open high-limit device — overheating | Replace filter; check airflow |
| 5 flashes | Flame sense with no call for heat | Technician required — gas valve issue |
| 6 flashes | 115V polarity or grounding issue | Licensed electrician required |
| 7 flashes | Low flame signal — dirty flame sensor | Clean flame sensor; call if issue persists |
| 8 flashes | Ignitor fault — no heat detected from ignitor | Technician required — ignitor replacement |
| 9 flashes | Rollout switch open | Shut off furnace immediately; call for service |
| Slow flash (green) | Normal standby / no call for heat | No action needed |
Pressure Switch Codes (2 Flashes): A Closer Look
Goodman and Amana high-efficiency furnaces are particularly prone to pressure switch errors in cold weather. The two most common causes are:
Blocked flue vent: The PVC intake and exhaust pipes that exit through an exterior wall can become blocked by ice, snow, or debris. Check the termination points on the outside of your home and clear any obstructions carefully.
Clogged condensate drain: High-efficiency furnaces pull so much heat from combustion gases that those gases condense into water. This water drains through a tube to a floor drain or condensate pump. If the drain clogs or freezes, it backs up and mimics a pressure switch failure. Clear the drain line using a wet/dry vacuum at the drain end.
Flame Sensor Cleaning (7 Flashes)
The flame sensor is a small metal rod that extends into the burner flame. Over time, it develops a white oxide coating that reduces its ability to detect the flame. Goodman and Amana flame sensors are straightforward to access: remove the two screws holding the sensor bracket, slide it out, and lightly rub the metal rod with fine steel wool or a dollar bill (avoid sandpaper, which leaves grit). Reinstall and test. If the 7-flash code returns, the sensor likely needs replacement.
When to Call a Professional
Rollout switch faults (9 flashes) mean flames escaped the heat exchanger. This is a fire and carbon monoxide hazard. Do not reset the furnace — turn it off at the thermostat and call for emergency service. Similarly, flame-sensed-without-call codes (5 flashes) suggest the gas valve is not closing properly, which requires professional diagnosis.
Burkhardt Heating has been servicing Goodman and Amana equipment across Southeastern Wisconsin for decades. Our NATE-certified technicians know these systems inside and out and carry common repair parts on every service vehicle.
Goodman/Amana Furnace Repair Near You
Fault codes are designed to protect your equipment and your family. Addressing them promptly — before the furnace fully locks out on the coldest night of the year — is always the right call.
If you see any of these codes, call Burkhardt at 414-206-3049. Our NATE-certified technicians can diagnose and repair the issue — usually in a single visit.
Ready to schedule service? Call Burkhardt Heating, Cooling, Plumbing & Electric at 414-206-3049 or contact us online. Available 24/7 for emergencies.
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