York TM9T100C16MP11 Furnace Error Codes

Two Stage Gas Furnace | Control Board: Integrated Furnace Control Board

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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?
Normal Operation - No Call for Heat Normal Operation - No Call for Heat Info — →
Normal Operation - Call for Heat Normal Operation - Call for Heat Info — →
Low Flame Signal Low Flame Signal Medium ✗ Call a pro →
No Call for G (Thermostat Wiring Issue) No Call for G (Thermostat Wiring Issue) Medium ✗ Call a pro →
Twinning Error / Incorrect Phasing Twinning Error / Incorrect Phasing Medium ✗ Call a pro →
Flame Present With Gas Off Flame Present With Gas Off Critical ✗ Call a pro →
Pressure Switch Stuck Closed Pressure Switch Stuck Closed Medium ✗ Call a pro →
Pressure Switch Stuck Open Pressure Switch Stuck Open Medium ✗ Call a pro →
Limit Switch Open / Open Fuse Limit Switch Open / Open Fuse Medium ✗ Call a pro →
Rollout Switch Open / Open Fuse Rollout Switch Open / Open Fuse Critical ✗ Call a pro →
Pressure Switch Opened During Operation Pressure Switch Opened During Operation Medium ✗ Call a pro →
Ignition Failure (3 Failed Attempts) Ignition Failure (3 Failed Attempts) Medium ✗ Call a pro →
Flame Lost During Heating Flame Lost During Heating Medium ✗ Call a pro →
Grounding or Line Polarity Fault Grounding or Line Polarity Fault Critical ✗ Call a pro →
Gas Valve Circuit Shorted Gas Valve Circuit Shorted Critical ✗ Call a pro →
Extended Limit Switch Open Extended Limit Switch Open Critical ✗ Call a pro →
Igniter Failure Igniter Failure Medium ✗ Call a pro →

How to Read the Error Code

Single multi-color LED (Red, Green, Amber) on the control board, visible through clear view port in blower compartment door. Numbered flash codes: LED turns ON for 1/4 second and OFF for 1/4 second, repeated for the code number. All flash code sequences broken by a 2-second OFF period. Supports LAST ERROR button for retrieving up to 5 stored fault codes from memory.

About This Model

The York TM9T100C16MP11 is a two stage gas furnace using the Integrated Furnace Control Board-series integrated furnace control (IFC) board.