EC code displayed; spa may run in economy mode and heat only during filter cycles.

Note: EC on many Aquavia Spa control systems indicates Economy mode, not a hardware fault.

• Check mode setting: Use the topside control panel to navigate to the mode settings. If set to Economy (EC), change to Standard (ST) or Auto as desired.
• Verify time and cycles: Ensure the clock and filter cycles are set correctly so heating occurs when you expect.
• Monitor operation: After changing mode, the EC indication should disappear and the spa will maintain set temperature continuously (in Standard mode).