Affiliate links may earn us a commission. As an Amazon Associate I earn from qualifying purchases. Affiliate disclosure
Code index · 13 entries
American Standard furnace error codes
What does your American Standard furnace error code mean? 13 codes from the American Standard furnace manual. Select a code for causes, how to fix it safely and when to call a pro. American Standard manufacturer manual (PDF) (opens in a new tab) ↗.
13 of these 13 American Standard furnace pages are marked call-a-pro because the source document points at gas, venting, refrigerant, high voltage or a control the manual does not leave to a homeowner. The other 0 start with a check the document describes, then say when to stop.
Related guides: Furnace Rollout Codes and Carbon Monoxide Safety · Furnace Flame Sensor: Symptoms, Codes and Cleaning · Furnace No Heat: Winter 2026 Checklist · Furnace Limit Switch Open: Blower Runs, No Heat · Furnace Pressure Switch Error: What It Means · Heat Pump Not Heating in the Cold · Furnace Ignition Lockout: It Tried to Light and Stopped · How to Read a Furnace LED Flash Code · Furnace Blowing Cold Air: Common Causes · Furnace Air Filters: How Often to Change and Why It Matters · Furnace Short Cycling: Causes and What to Check · Furnace Repair or Replace: How to Decide.
Open limit: the main thermal limit, a rollout switch, or the reverse airflow switch.
Flame was detected when it should not be present.
Open inducer limit switch, or open condensate pressure switch.
Open fuse. The control diagram in this installer's guide labels the low-voltage fuse as 5 amp.
Flame current is low, but still strong enough to allow operation.
Retry exceeded: flame was never sensed. One-hour lockout after 3 times.
Recycles exceeded: flame was sensed and then lost. One-hour lockout after 10 times.
Shorted pressure switch, 1st stage.
1st stage gas valve was not energized when it should be, and that fault was exceeded after 10 times.
Open pressure switch, 2nd stage.
Igniter fault: the igniter relay fails, or the igniter is open.
Open pressure switch, 1st stage.
The 1st stage gas valve (MVL) is energized when it should be off.
Parts named in American Standard codes
Parts the American Standard codes above point to. Check your model's manual before buying, and leave gas and venting work to a licensed pro.
- Flame sensorSearch on Amazon
- Hot surface igniterSearch on Amazon
- Pressure switch hoseSearch on Amazon
Search on Amazon opens search results for the part name. It does not confirm a fit. As an Amazon Associate I earn from qualifying purchases.
Parts and tools for American Standard furnace codes →
Source: American Standard manufacturer manual (PDF) (opens in a new tab) ↗ · Last updated