What does the alarm code A004 mean on my Ruud Ultra Plug-in Heat Pump with HydroBoost (120V Shared Circuit)?

CAUTION: For your safety, always consult the manual or a professional before attempting any fixes.

Alarm Code A004 Description: Compressor Shutdown: Discharge-Suction Trip

Possible Cause: Heating source defaults to elements due to compressor malfunction

What To Do:

1. Confirm fan is operational while compressor is on. If the fan is not operational, check continuity from the middle (ground) terminal to either outside terminal. If there is a 60V or higher reading, the fan should be running and will need to be replaced. If not, replace the control board (rare occurrence).
2. Confirm filter screen is clean.
3. Inspect compressor and surrounding components for any obvious signs of refrigerant leak (e.g., oily residue). If the compressor is not operational or there are signs of leakage, the unit will need to be replaced as we do not service sealed system parts.

If the problem persists, please call our customer service at 1-800-432-8373.