Display shows E18 and pump runs only at minimum speed regardless of settings

Safety first: Turn off power before inspecting the unit.

• Check ventilation and temperature: Ensure the Aquaflow pump has adequate airflow and is not overheating. Clear obstructions and provide shade if necessary.
• Review settings: Enter the configuration menu and verify that maximum speed limits are not set too low.
• Power cycle: Disconnect power for 5 minutes to clear temporary derate conditions, then restore.

If E18 and low-speed operation persist with normal temperatures and correct settings, the control board may be locked in a safe mode and require replacement.