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 Critical ✗ Call a pro →
Continuous OFF Check Power Critical ✓ Yes →
2 Flashes System Lockout (Retries or Recycles Exceeded) High ✓ Yes →
3 Flashes Draft Pressure Error High ✓ Yes →
4 Flashes Open Temperature Limit Circuit High ✓ Yes →
5 Flashes Flame Sensed When No Flame Should Be Present Critical ✗ Call a pro →
6 Flashes 115V AC Power Reversed, Poor Grounding, or System Voltage Too Low Medium ✗ Call a pro →
7 Flashes Gas Valve Circuit Error Critical ✗ Call a pro →
8 Flashes Low Flame Sense Signal Medium ✓ Yes →
9 Flashes Igniter Circuit / Grounding Fault High ✗ Call a pro →

How to Read the Error Code

A single LED on the IFC board communicates status and faults through blink patterns. Slow flash = normal standby, fast flash = call for heat active, continuous ON = replace IFC, continuous OFF = no power. Fault codes are indicated by counted flash sequences (2-9 flashes) separated by 2-second pauses. Visible through the blower compartment door sight glass.

About This Model

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