FL1 means your spa is detecting low water flow. The most common cause is a dirty filter cartridge or a blocked circulation pump impeller.

FLO means your spa flow switch is not detecting adequate water movement. Check your filter first, then inspect the flow switch and circulation pump.

How do I diagnose a spa that won't heat?

Start by checking filter cleanliness and water flow. If flow is fine and the spa still won't heat, the heater element, high-limit sensor, or circulation pump is the most likely cause.

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Spa Diagnostic Centre — Error Codes and Symptom Checker

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Most common spa fixes

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Parts Assistant

Hi — I can help diagnose your spa problem. What's your spa doing?