Trane · *UH1/*DH1 gas furnace · 8 code records
Search the exact display or flash pattern. Meanings come from the linked furnace manual and apply only to its named models; they are not repair instructions.
These furnace records come from three official manufacturer manuals and remain tied to their named equipment families: Daikin DM97MC/DC97MC, Trane *UH1/*DH1, and Goodman 80% single-stage furnaces. They are not a general HVAC code list, and technician-facing displays are not homeowner repair instructions. The article scope may not cover every Trane *uh1/*dh1 gas furnace model or revision.
2 flashesTrane’s *UH1/*DH1 furnace guide lists 2 flashes as: The integrated furnace control has entered system lockout after retries or recycles were exceeded.
Limited to the *UH1 and *DH1 gas-furnace models listed in Trane guide 18-CD29D1-14-EN. Its integrated-control flash codes are technician-facing diagnostics, not homeowner repair steps. Confirm the complete model and use a qualified HVAC professional.
3 flashesTrane’s *UH1/*DH1 furnace guide lists 3 flashes as: The draft-pressure-switch circuit is not closed as expected.
Limited to the *UH1 and *DH1 gas-furnace models listed in Trane guide 18-CD29D1-14-EN. Its integrated-control flash codes are technician-facing diagnostics, not homeowner repair steps. Confirm the complete model and use a qualified HVAC professional.
4 flashesTrane’s *UH1/*DH1 furnace guide lists 4 flashes as: The high-limit switch is open.
Limited to the *UH1 and *DH1 gas-furnace models listed in Trane guide 18-CD29D1-14-EN. Its integrated-control flash codes are technician-facing diagnostics, not homeowner repair steps. Confirm the complete model and use a qualified HVAC professional.
5 flashesTrane’s *UH1/*DH1 furnace guide lists 5 flashes as: Flame is sensed while the gas valve is off.
Limited to the *UH1 and *DH1 gas-furnace models listed in Trane guide 18-CD29D1-14-EN. Its integrated-control flash codes are technician-facing diagnostics, not homeowner repair steps. Confirm the complete model and use a qualified HVAC professional.
6 flashesTrane’s *UH1/*DH1 furnace guide lists 6 flashes as: The control reports reversed 115-volt polarity or inadequate grounding.
Limited to the *UH1 and *DH1 gas-furnace models listed in Trane guide 18-CD29D1-14-EN. Its integrated-control flash codes are technician-facing diagnostics, not homeowner repair steps. Confirm the complete model and use a qualified HVAC professional.
7 flashesTrane’s *UH1/*DH1 furnace guide lists 7 flashes as: The gas-valve circuit is reporting an error.
Limited to the *UH1 and *DH1 gas-furnace models listed in Trane guide 18-CD29D1-14-EN. Its integrated-control flash codes are technician-facing diagnostics, not homeowner repair steps. Confirm the complete model and use a qualified HVAC professional.
8 flashesTrane’s *UH1/*DH1 furnace guide lists 8 flashes as: The flame-sensor signal is below the level expected by the control.
Limited to the *UH1 and *DH1 gas-furnace models listed in Trane guide 18-CD29D1-14-EN. Its integrated-control flash codes are technician-facing diagnostics, not homeowner repair steps. Confirm the complete model and use a qualified HVAC professional.
9 flashesTrane’s *UH1/*DH1 furnace guide lists 9 flashes as: The control reports an igniter-circuit or grounding condition.
Limited to the *UH1 and *DH1 gas-furnace models listed in Trane guide 18-CD29D1-14-EN. Its integrated-control flash codes are technician-facing diagnostics, not homeowner repair steps. Confirm the complete model and use a qualified HVAC professional.
No matching code in this manufacturer article set. Check the exact display on the official support site.
Before you act
HVAC & furnaces: These are technician-facing gas-furnace references, not repair guides. Do not open the furnace, test wiring or gas components, adjust combustion settings, or reset safety devices. Use a qualified HVAC professional; if you smell gas, leave the area and contact your gas utility or emergency services from a safe location.
These summaries describe the manufacturer's published explanation. They are not a remote diagnosis and do not establish that a specific component has failed.