Trane
System Lockout or Safety Shutdown
Thermostat shows system OFF or in standby even though mode is set to HEAT or COOL
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
High-pressure or low-pressure lockout on Trane outdoor unit, Flame failure lockout on furnace, Repeated compressor trips, Thermostat lockout timer active after faults
How to Fix / Troubleshooting
Safety: Investigate any burning smells, unusual noises, or smoke immediately and shut off power.
- Step 1 – Check thermostat alerts: Look for any messages in the thermostat diagnostics or alerts menu indicating why the system is locked out.
- Step 2 – Inspect outdoor unit: Verify the outdoor unit is not iced over, blocked, or making unusual noises. Clear debris around the unit.
- Step 3 – Inspect furnace: Check for error codes on the furnace control board and follow the fault code chart.
- Step 4 – Power cycle system: Turn off power to both indoor and outdoor units for 5–10 minutes, then restore power to clear temporary lockouts.
- Step 5 – If lockouts recur: There is likely an underlying mechanical or refrigerant issue that requires a qualified HVAC technician.
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Repair Difficulty
Hard
4/5
Required Part
Trane Outdoor Unit Safety Controls or Trane Furnace Control Board
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