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Troubleshooting code

Back to all 5TWX7024A1 error codes

Trane 5TWX7024A1 LH troubleshooting

High-pressure or DTC lockout. Use this page to document the issue and prepare for service. GreenFlow should handle diagnosis for electrical, refrigerant, lockout, or recurring conditions.

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What the code means

LH: High-pressure or DTC lockout

Trane ODR-SVN003D-EN multi-speed status/fault tables for 5TWX7 heat pumps with ComfortSeek identifies LH as HPCO/DTC MOC HPS circuit open lockout.

System area
Pressure safety circuit
Service level
Call GreenFlow

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.

LH questions

What does LH mean on a Trane 5TWX7024A1?

Trane ODR-SVN003D-EN multi-speed status/fault tables for 5TWX7 heat pumps with ComfortSeek identifies LH as HPCO/DTC MOC HPS circuit open lockout.

What Trane message is associated with LH?

The Trane source used for this page associates LH with "High-pressure or DTC lockout". Match the visible display text, LED pattern, or alert wording to the exact code whenever possible.

What system area does LH point to?

This code is grouped under pressure safety circuit in the source-backed Trane troubleshooting data.

Which Trane documentation supports this LH page?

Source-backed Trane ODR-SVN003D-EN multi-speed status/fault tables for 5TWX7 heat pumps with WeatherGuard and ComfortSeek. Local products are matched by documented 5TWX7 base model family.

Is LH related to a pressure safety condition?

The Trane source row places this code in a pressure-related system area: Pressure safety circuit. Do not treat a pressure-safety code as a thermostat-only issue.

Does LH indicate a lockout condition?

The source-backed description for this row includes a lockout condition. Record the exact code and avoid repeated reset attempts before the fault history is documented.

What information should be captured for LH 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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