Code 59 (18VS,19VS/V-HP/AC) — Discharge Temp out of Range Event

What does 59 mean?

This fault for 18VS,19VS/V-HP/AC units indicates that the discharge temperature sensor has detected a temperature outside its normal operating range. This protects the compressor from overheating.

• Faulty discharge temperature sensor
• Refrigerant system issues (e.g., low charge, restriction)
• Compressor overheating due to excessive load
• Blocked condenser coil

Click steps to track your progress.

1. 1

   Turn off the power to the outdoor unit at the circuit breaker for at least 30 seconds.

2. 2

   Ensure the outdoor unit's coil is clean and free of obstructions, and the fan is operating.

3. 3

   Check that indoor air filters are clean and airflow is not restricted.

4. 4

   If the 'out of range' event recurs, contact a qualified HVAC technician immediately, as this indicates a serious compressor or refrigerant system problem.