What should I do if my Ruud Ultra Plug-in Heat Pump with HydroBoost (120V Shared Circuit) indicates Alarm Code A120?

CAUTION: For your safety, ensure that you handle any electrical connections with care to prevent potential hazards.

Possible Cause: There’s a malfunction with the Shut-Off Valve. What To Do:

1. Carefully inspect and ensure the wiring connections are secure.
2. Unplug the Shut-Off valve and then plug it back in.
3. If the alarm continues to appear, please call customer service at 1-800-432-8373 for further assistance.

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