Controller displays E07 and pump speed cannot be adjusted on variable-speed Calpeda pool pump

Safety first: Only trained personnel should work inside inverter-driven control boxes. Isolate power and wait several minutes for DC bus capacitors to discharge.

• Check supply voltage stability: Measure line voltage at the Calpeda VFD input while other large loads (e.g., heaters) switch on and off. If voltage spikes are present, consult an electrician to correct supply issues.
• Inspect for visible damage: With power off, open the VFD enclosure and look for burnt components, bulging capacitors, or discoloration. Do not touch circuit boards directly.
• Verify grounding: Ensure the earth/ground conductor is securely connected to the Calpeda control box and motor frame. Poor grounding can cause inverter faults.
• Reset to default parameters: Using the Calpeda VFD keypad, restore factory parameters if they may have been altered. Refer to the Calpeda manual for the correct procedure.
• Attempt a controlled restart: Power up, clear the E07 fault via the keypad, and ramp the speed up slowly. If the error recurs, the inverter module is likely defective and should be replaced as a complete unit.