American Standard AUD1B080A9H31A Furnace Error Codes

Single Stage Gas Furnace | Control Board: White-Rodgers 50A65 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 Draft Pressure Error High ✗ Call a pro →
4 Flashes Open Temperature Limit Circuit High ✓ Yes →
5 Flashes Flame Sensed When No Flame Should Be Present High ✗ Call a pro →
6 Flashes 115V AC Power Reversed, Poor Grounding, or System Voltage Too Low Low ✗ Call a pro →
7 Flashes Gas Valve Circuit Error High ✗ Call a pro →
8 Flashes Low Flame Sense Signal Low ✓ Yes →
9 Flashes Igniter Circuit / Grounding Fault High ✗ Call a pro →

How to Read the Error Code

The White-Rodgers 50A65 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 system can be reset from lockout by cycling power off-on-off-on within 30 seconds.

About This Model

The American Standard AUD1B080A9H31A is a single stage gas furnace using the White-Rodgers 50A65 Integrated Furnace Control (IFC) control board.