Trane Error Code d8: De-rate: high coil temperature (AC)
Trane error code d8 on a air conditioner means: De-rate: high coil temperature. It is also called Trane diagnostic code d8.
Homeowner? What Trane code d8 means for you
Check, then call Your air conditioner is reporting: De-rate: high coil temperature. This is often caused by something simple. Try the safe checks below; if the code returns, book a service call before it turns into a no-heat or no-hot-water emergency.
Safe things you can check yourself
- Check the thermostat: right mode (Heat or Cool), set a few degrees past room temperature, and fresh batteries if it uses them.
- Check both breakers and the outdoor disconnect box beside the outdoor unit; all should be ON.
- Look at the air filter. If it is grey and clogged, replace it; a blocked filter causes many shutdowns.
- Keep about 2 feet around the outdoor unit clear of leaves, grass and debris.
- If you see ice on the pipes or the indoor coil, turn the system off and run only the fan for a few hours, then call a technician.
- Try one reset: turn the power off for 30 seconds, then back on. If the code comes back, stop resetting and call a technician.
Call (647) 657-2977Book a service call
Licensed technicians serving Vaughan, Toronto and the GTA.
What does Trane error code d8 mean?
Capacity reduced because coil temperature is high. Manual lists only the meaning (A1000BA board); steps are general checks drawn from other sections of the guide.
Applies to: Trane 5TTR7 multi-speed AC (5TTR7024A-060A)
Common causes of Trane code d8
- Dirty outdoor coil or poor airflow
- Overcharge
- Sensor error
Trane models that use code d8
5TTR7024A5TTR7036A5TTR7048A5TTR7060A
Other Trane AC codes
All Trane Air Conditioner error codes →
Trane code d8: homeowner questions
What does Trane code d8 mean?
De-rate: high coil temperature. Capacity reduced because coil temperature is high. Manual lists only the meaning (A1000BA board); steps are general checks drawn from other sections of the guide.
Is it safe to keep using my air conditioner with code d8?
It depends on the cause. This is often caused by something simple. Try the safe checks below; if the code returns, book a service call before it turns into a no-heat or no-hot-water emergency.
Can I reset Trane code d8 myself?
You can try one reset (power off for 30 seconds, then on). If Trane code d8 comes back, the cause is still there and a licensed technician should check it.
Who can fix Trane code d8 near me?
Aurora Star Tech Inc. repairs Trane air conditioners in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.
Homeowner help: AC Running But Not Cooling: What to Check
Troubleshooting guides
- Not cooling All brands · Air Conditioner
Source: Trane ODR-SVN002E-EN (5TTR7/5TWR7 installer's guide) - section Integrated Variable Speed Control Board LED Indicators, Table 18 (A1000BA models). Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.