Lennox Heat Pump Error Code DS2 ON / DS1 OFF

This code means the system has entered a high pressure lockout because the high pressure switch tripped five times during a single Y1 demand cycle. The control board tracks each trip, and after the fifth occurrence it locks the system out to protect the compressor from damage. The lockout will not clear on its own and requires a technician to identify and correct the root cause before the unit can resume normal operation.

The system will not continue to run once it has entered lockout, which is the intended behavior. The lockout is a protective measure to prevent compressor damage from repeated high pressure events. Do not attempt to bypass or repeatedly reset the system without addressing the underlying cause, as doing so can damage the compressor and lead to a more costly repair.

Repair costs vary depending on the cause. Cleaning coils and clearing airflow obstructions is typically lower cost, often in the range of $100 to $250 including a service call. Refrigerant charge adjustment can run $150 to $400 depending on how much refrigerant is involved. Fan motor replacement generally falls between $200 and $600 depending on the motor and labor rates in your area. A full diagnosis from a licensed technician is the best way to get an accurate estimate.

Some contributing factors can be addressed by a homeowner, such as replacing a dirty air filter, clearing debris from around the outdoor unit, and making sure supply and return registers are open and unobstructed. However, checking refrigerant charge, measuring fan motor current draws, and inspecting high pressure switch wiring all require proper tools and technical knowledge. A licensed HVAC technician should be contacted to fully diagnose and resolve the lockout condition.

A power cycle reset may temporarily clear the lockout and allow the unit to restart, but if the root cause is not corrected the high pressure switch will continue to trip and the lockout will return. Repeated resets without diagnosing the cause risk compressor damage. A proper repair addressing airflow, charge, or component issues is required for a lasting resolution.