There is a Verified "Dry" (drY or dY) Condition in the Heater.
The "dr" or "HEATER MAY BE DRY WILL RETEST SHORTLY" Fault has occurred 3 times in a row without a successful Heating Cycle and Spa Functions are Disabled. There is Not enough Water in the Heater to Start it. After the Problem has been Resolved, you Must Press Any Button to Reset and Restart Heater Start Up. Check for Water Level, Flow Restrictions, Closed Valves, Air Bubbles, and Pump Prime, or Continue for a Detailed Test Procedure.
