hp
Moderate
Trane · HVAC Systems (AC, Furnaces & Heat Pumps)
High Pressure Lockout
Quick Answer
Error code HP on your Trane HVAC Systems (AC, Furnaces & Heat Pumps) means: High Pressure Lockout. This is usually fixable — see the step-by-step guide below.
Likely Causes
How to Fix It
1
Wait for the high-pressure lockout timer to reset (typically 5 minutes)
2
Clean the condenser coil thoroughly with water and approved cleaner
3
Verify the condenser fan motor is operating at full speed
4
Check that nothing is obstructing airflow around the outdoor unit (maintain 24 inches clearance)
5
A licensed HVAC technician should check pressures and verify proper refrigerant charge
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Condenser fan motor
High-pressure switch
Coil cleaner
Fan capacitor
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