What the code means
Ignition Off: No power or ignition-board failure
The Trane Precedent gas heat fault-code table identifies ignition-board LED off as no power or board failure.
Troubleshooting code
Back to all DHC074H(3,4)*(L,M,H,X,Y,Z)A***7 error codes
Trane DHC074H(3,4)*(L,M,H,X,Y,Z)A***7 Ignition Off troubleshooting
No power or ignition-board failure. Use this page to document the issue and prepare for service. GreenFlow should handle diagnosis for electrical, refrigerant, lockout, or recurring conditions.
Safe checks before calling
- Confirm the thermostat is on, set correctly, and calling for heating or cooling.
- Check the air filter and visible return-air path for obvious airflow restrictions.
- Look around the outdoor unit for leaves, snow, ice, or other visible obstructions without opening the cabinet.
- Take photos of the thermostat, outdoor unit, nameplate, and any visible flash pattern before scheduling service.
When to stop and call GreenFlow
Call GreenFlow if the code repeats, the system is locked out, heating or cooling is not restored, there is ice buildup, electrical odor, unusual noise, or any issue involving pressure switches, sensors, wiring, refrigerant, reversing-valve operation, or warranty coverage.
Share the visible code, model and serial number if available, photos, current symptoms, and whether the issue affects heating, cooling, or both.
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View service detailsIgnition Off questions
What does Ignition Off mean on a Trane DHC074H(3,4)*(L,M,H,X,Y,Z)A***7?
The Trane Precedent gas heat fault-code table identifies ignition-board LED off as no power or board failure.
What Trane message is associated with Ignition Off?
The Trane source used for this page associates Ignition Off with "No power or ignition-board failure". Match the visible display text, LED pattern, or alert wording to the exact code whenever possible.
What system area does Ignition Off point to?
This code is grouped under precedent gas heat ignition board in the source-backed Trane troubleshooting data.
Which Trane documentation supports this Ignition Off page?
Source-backed Trane Commercial HVAC Help Center Precedent gas heat fault-code table for ignition-board diagnostics.
Is Ignition Off an LED or flash-pattern code?
Yes. The Trane source row for this item is based on a displayed LED or flash pattern. Count the pattern exactly and compare it with the documented Ignition Off entry before interpreting the fault.
Is Ignition Off related to combustion or furnace safety controls?
The Trane source row places this code in a combustion, ignition, limit, flame, or pressure-switch safety context. These codes should be interpreted from the exact equipment board and documented flash pattern.
Does Ignition Off involve a control, board, drive, or module?
The Trane source row points to precedent gas heat ignition board. Record the exact code and visible alert text before any reset so the control history is not lost.
What information should be captured for Ignition Off before clearing alerts?
Capture the exact code, any displayed alert text, the model and serial number, thermostat or control status, operating mode, symptoms, and photos of the display or LED pattern before the alert history is cleared.
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