A127 - Circuit B High Head Pressure Alarm

What does A127 mean?

An alarm indicating high head pressure in Circuit B. The circuit will stop to prevent damage.

• Dirty condenser coil
• Condenser fan failure
• System overcharged with refrigerant

Click steps to track your progress.

1. 1

   Clean the outdoor unit's condenser coils thoroughly.

2. 2

   Check if the outdoor fan is spinning freely and without obstruction.

3. 3

   Contact a technician to verify the refrigerant charge.