Code 32-15 (Shutdown) or 32-55 (Lockout) - Compressor low suction pressure detected.

What does 32-15 / 32-55 mean?

The system has detected low suction pressure, exceeding its soft or hard limits, leading to a shutdown (32-15). Four occurrences of 32-15 result in a 2-hour lockout (32-55). The system will attempt to restart after a 5-minute delay.

• Blockage in the liquid line.
• Stuck or faulty TXV/EXV (expansion valve).
• No or insufficient airflow across the indoor evaporator coil.
• Low system refrigerant charge.
• Low ambient temperatures increasing diagnostic sensitivity.

Click steps to track your progress.

1. 1

   Ensure there is proper airflow across the indoor evaporator. Check for dirty air filters and clear any blocked return or supply vents.

2. 2

   Inspect the liquid line for any signs of blockage or restriction (requires professional assessment).

3. 3

   If you suspect low refrigerant charge or a faulty expansion valve, contact a qualified HVAC technician for diagnosis and repair.

4. 4

   Confirm the indoor fan is operating correctly and circulating air.