What actions are advised if my Ruud Ultra Plug-in Heat Pump with HydroBoost (120V Shared Circuit) displays Alarm Code A121?

CAUTION: For your safety, when handling electrical components, ensure you follow safety precautions to avoid potential hazards.

Possible Cause: There’s an issue with the Shut-Off Valve’s functionality. What To Do:

1. Meticulously inspect and confirm that the wiring connections are secure and in place.
2. Disconnect the Shut-Off valve and then reconnect it.
3. Should the alarm continue to be displayed, please reach out to customer service at 1-800-432-8373 for expert assistance.

This answer is applicable for the following model: Ruud Ultra Plug-in Heat Pump with HydroBoost (120V Shared Circuit).