Code 33-55 Compressor Low Discharge Lockout — System locked out due to repeated low discharge pressure

What does 33-55 mean?

This lockout occurs after 6 instances of 'Code 33-15 Compressor Low Discharge Shutdown' within a 2-hour period. The system will be locked out for 2 hours.

• Repeated occurrences of low discharge pressure.
• Malfunctioning reversing valve.
• Low refrigerant charge.
• Missing or stuck TXV/EXV (Thermostatic/Electronic Expansion Valve).

Click steps to track your progress.

1. 1

   Wait for the 2-hour lockout period to expire.

2. 2

   Address the underlying causes of Code 33-15 (e.g., check reversing valve, refrigerant charge, TXV/EXV).

3. 3

   If the problem persists, contact a qualified technician for further diagnosis and repair.