American Standard AUH1B080A9H31A Furnace Error Codes

Single Stage Gas Furnace | Control Board: Integrated Furnace Control (IFC)

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Disclaimer
This information is for reference purposes only and does not guarantee accuracy or completeness. Always consult your owner's manual and a licensed HVAC technician for diagnosis and repair. Any actions taken based on this information are at your own risk.

All Error Codes

Code Name Severity DIY?
Slow Flash Normal - No Call for Heat Info — →
Fast Flash Normal - Call for Heat Info — →
Continuous ON Replace IFC High ✗ Call a pro →
Continuous OFF Check Power High ✓ Yes →
2 Flashes System Lockout (Retries or Recycles Exceeded) High ✗ Call a pro →
3 Flashes Pressure Switch Error High ✗ Call a pro →
4 Flashes Open Limit Device High ✓ Yes →
5 Flashes Flame Sensed When No Flame Should Be Present High ✗ Call a pro →
6 Flashes 115V AC Power Reversed or Poor Grounding Low ✗ Call a pro →
7 Flashes Gas Valve Circuit Error High ✗ Call a pro →
8 Flashes Low Flame Sense Signal Low ✓ Yes →
9 Flashes Check Igniter High ✗ Call a pro →

How to Read the Error Code

The Integrated Furnace Control (IFC) has a diagnostic LED that communicates status and fault codes through flash patterns. A slow flash indicates normal standby (no call for heat), a fast flash indicates normal operation with an active call for heat, continuous ON means the IFC needs replacement, and continuous OFF means no power. Numbered flash codes (2 through 9) indicate specific faults. The diagnostic codes are listed on the electrical schematic page of the manual.

About This Model

The American Standard AUH1B080A9H31A is a single stage gas furnace using the Integrated Furnace Control (IFC) control board.