Display shows dr or DR; spa may attempt to run but heater is disabled.

Safety: Turn off power before removing filters or opening unions.

• Clean or bypass filter: Remove and thoroughly rinse the filter. Run the spa briefly without the filter to see if the dr code clears.
• Check valves and plumbing: Confirm that all valves are fully open and that there are no visible kinks in flexible hoses.
• Bleed air: Loosen pump and heater unions to release trapped air, then retighten.
• Observe circulation: With power restored, verify strong water movement at the circulation return. Weak flow suggests a failing pump that may need replacement.