Trane Error Code Fault history mode: Fault history diagnostics mode (Heat Pump)

Updated October 15, 2026 · by Aurora Star Tech Inc.

Trane error code Fault history mode on a heat pump means: Fault history diagnostics mode. It is also called Trane diagnostic code Fault history mode.

Low severityHeat PumpTrane 5TWR7

Homeowner? What Trane code Fault history mode means for you

Usually minor Your heat pump is reporting: Fault history diagnostics mode. This code is usually informational or minor. The safe checks below often clear it; call us if it keeps showing up.

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) 657-2977 Book a service call

Licensed technicians serving Vaughan, Toronto and the GTA.

What does Trane error code Fault history mode mean?

The manual says the digital display offers a diagnostics mode that cycles through historical faults, but does not give the entry steps in the text. Multiple active faults cycle automatically.

Applies to: 5TTR7 A-C / 5TWR7 heat pump multi-speed outdoor drive (AOC)

Safety: Gas, electrical and refrigerant work must be done by a licensed technician. Turn off power and gas before servicing, never bypass a safety control, and always follow the manufacturer's manual for your exact model.

Trane models that use code Fault history mode

5TWR7024A 5TWR7036A 5TWR7048A 5TWR7060A

Other Trane Heat Pump codes

Code	Meaning
F5	AC over-current fault
F6	Drive high temperature fault
F7	AC input voltage low
F8	DC output voltage fault
F9	Drive (MOC) internal fault
FA	Outdoor ambient sensor fault
FC	Coil temperature sensor fault
Fd	Discharge temperature sensor fault
Force defrost button	Force a defrost cycle
Fr	No 24 VAC R signal at outdoor control (heat pump)
H5	Hard lock: drive AC input over-current
H6	Hard lock: high drive IPM temperature

All Trane Heat Pump error codes →

Trane code Fault history mode: homeowner questions

What does Trane code Fault history mode mean?

Fault history diagnostics mode. The manual says the digital display offers a diagnostics mode that cycles through historical faults, but does not give the entry steps in the text. Multiple active faults cycle automatically.

Is it safe to keep using my heat pump with code Fault history mode?

Usually yes. Code Fault history mode is normally minor, but if it keeps coming back have it checked.

Can I reset Trane code Fault history mode myself?

You can try one reset (power off for 30 seconds, then on). If Trane code Fault history mode comes back, the cause is still there and a licensed technician should check it.

Who can fix Trane code Fault history mode 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 5TTR7/5TWR7 installation ODR-SVN002E-EN, Tables 17-18 notes, p.24-26. 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.