Model reference
American Standard UD2B080A9V3VB
Furnace
2 documents19 error codes2 service modes
Available documentation
Service Manual
- Service Facts30 pg
Installation Guide
- Installer's Guide - Variable Speed, 2-Stage Upflow / Horizontal and Downflow / Horizontal, Gas-Fired Furnaces24 pg
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Error codes (19)
CodeMeaning
1 GREENStandby mode or call for cooling.1 GREEN / 1 AMBER1st stage call for heat.1 REDFlame sensed when no flame should be present.10 REDGas valve energized without call for heat.12 REDIgnitor relay failure internal in board2 GREEN / 1 AMBER2nd stage call for heat.2 REDPressure switch stuck closed.3 DOUBLE RED2nd stage pressure switch open; system reverts back to 1st stage heat.3 GREEN / 1 AMBERW2 call present without W1.3 RED1st stage pressure switch is open or not closing.4 GREEN / 1 AMBERY call present without G.4 REDOpen thermal limit or open rollout.5 REDOpen low voltage fuse.6 RED1st stage pressure switch opened 5 times within one cycle7 REDSystem lockout Retry.8 REDSystem lockout Recycle.9 REDReverse polarity or poor grounding.RAPID GREEN / 1 AMBERLow flame sense current.SOLID REDGas valve relay failure internal in boardService modes (2)
- Fault Code ResetPush and hold the last error button between 5 and 10 seconds to clear all faults from memory.
- Fault Code RetrievalPush and release the last error button for 1 to 5 seconds
Full entry steps, exit procedures, and test sequences are available in Max.
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