What steps are recommended if my Ruud Ultra Plug-in Heat Pump with HydroBoost (120V Shared Circuit) displays Alarm Code A123?

CAUTION: For your safety, when working with electrical components, always exercise caution to prevent potential hazards.

Possible Cause: There’s a potential malfunction or absence of the Shut-Off Valve. What To Do:

1. Carefully inspect and ensure that the wiring connections are appropriately secure.
2. Disconnect the Shut-Off valve and then reconnect it.
3. If the alarm remains active, please contact customer service at 1-800-432-8373 for specialized assistance.

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