Trane Error Code 2nd digit d: Discharge temperature sensor fault (A1000AA board) (Heat Pump)
Trane error code 2nd digit d on a heat pump means: Discharge temperature sensor fault (A1000AA board). It is also called Trane diagnostic code 2nd digit d.
Homeowner? What Trane code 2nd digit d means for you
Check, then call Your heat pump is reporting: Discharge temperature sensor fault (A1000AA board). 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.
- In winter, keep snow and ice off and away from the outdoor unit. A short defrost cycle with steam is normal.
- 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 2nd digit d mean?
On A1000AA boards the right-hand 7-segment digit shows the fault and the left digit shows status; this value means: discharge temperature sensor fault. Manual gives only the meaning; steps are general checks.
Applies to: Trane 5TWR7 multi-speed heat pump (5TWR7024A-060A) with A1000AA control
Common causes of Trane code 2nd digit d
- Sensor unplugged or damaged wire
- Failed sensor
Trane models that use code 2nd digit d
5TWR7024A5TWR7036A5TWR7048A5TWR7060A
Other Trane Heat Pump codes
All Trane Heat Pump error codes →
Trane code 2nd digit d: homeowner questions
What does Trane code 2nd digit d mean?
Discharge temperature sensor fault (A1000AA board). On A1000AA boards the right-hand 7-segment digit shows the fault and the left digit shows status; this value means: discharge temperature sensor fault. Manual gives only the meaning; steps are general checks.
Is it safe to keep using my heat pump with code 2nd digit d?
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 2nd digit d myself?
You can try one reset (power off for 30 seconds, then on). If Trane code 2nd digit d comes back, the cause is still there and a licensed technician should check it.
Who can fix Trane code 2nd digit d near me?
Aurora Star Tech Inc. repairs Trane heat pumps 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 · Heat Pump Not Heating or Blowing Cold Air
Troubleshooting guides
- Force a defrost cycle with the button Trane · Heat Pump
- Forcing a defrost - Trane 5TWR7 Trane · Heat Pump
Source: Trane ODR-SVN002E-EN (5TTR7/5TWR7 installer's guide) - section Integrated Variable Speed Control Board LED Indicators, Table 17 (A1000AA 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.