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Troubleshooting code

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Trane 4TWV0X36A1 Err 67.08 troubleshooting

Compressor discharge sensor not attached. 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

Err 67.08: Compressor discharge sensor not attached

The Trane variable-speed alert table identifies CD T UNATCHD as a compressor discharge temperature sensor not attached to the compressor in heating mode.

System area
Compressor discharge sensor
Service level
Service recommended

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.

Err 67.08 questions

What does Err 67.08 mean on a Trane 4TWV0X36A1?

The Trane variable-speed alert table identifies CD T UNATCHD as a compressor discharge temperature sensor not attached to the compressor in heating mode.

Is Err 67.08 a heating-mode alert?

Yes. The Trane variable-speed alert table identifies this compressor-discharge-temperature-sensor condition in heating mode.

What system area is involved with Err 67.08?

This code is tied to the compressor discharge temperature sensor, also referenced in the Trane service facts as compressor dome temperature sensor information.

What display text may appear with Err 67.08?

The Trane service-facts alert table uses the display text CD T UNATCHD or CDTUNATCHD for this condition.

What alert group does Err 67.08 belong to?

The code belongs to the temperature-sensor fault group 67. Err 67.08 is the sub-alarm for the compressor discharge temperature sensor not attached condition.

What can the outdoor unit do when Err 67.08 occurs?

The Trane service-facts table describes a heating limp-along response with compressor operation limited while the condition is active.

What happens after the Err 67.08 condition clears?

The Trane service-facts table indicates the system can ramp back toward demand speed and resume normal operation after the condition clears.

Is Err 67.08 usually a homeowner-serviceable issue?

No. The source-backed meaning involves compressor discharge sensor attachment, which should be handled by a trained HVAC technician rather than by opening the outdoor unit.

What should be recorded before service for Err 67.08?

Record the visible code or alert text, note whether heating or cooling is affected, and take photos of the thermostat, outdoor unit, nameplate, and any visible display before alert history is cleared.

Can the CDA or thermostat alert history help with Err 67.08?

Yes. The Trane documentation describes active alerts and alert history on the Communicating Display Assembly, so preserving the visible alert information helps service review.

Should alert history be cleared before Err 67.08 is documented?

Do not clear alert history before documenting it. The service facts note that clearing alert history also clears active alerts and resets the outdoor control.

Where does the Trane service documentation show related temperature information?

The technician monitor menu lists CDTS, described as the compressor dome temperature sensor, along with dome temperature information.

Does the Trane manual list Err 67.08 as a refrigerant-charge code?

No. The source-backed meaning for Err 67.08 is compressor discharge temperature sensor not attached in heating mode, not a low-charge or high-pressure code.

Is Err 67.08 the same as Err 67.04 or Err 67.05?

No. Err 67.04 and Err 67.05 are discharge-temperature-sensor fault entries by operating mode. Err 67.08 is specifically the not-attached compressor discharge sensor condition in heating mode.

Which Trane documentation supports this Err 67.08 page?

Source-backed Trane 4T-V0-SF-1Q-EN Service Facts variable-speed alert-code table for 4TWV0/4TTV0 outdoor units.

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