Bell and Gossett E01

What does Bell and Gossett E01 mean?

E01 indicates the e-90E Smart Pump's internal communication link between its control board and drive module has been lost. The pump cannot coordinate motor operation without this link and will shut down immediately. This is a locking error that requires a manual restart after power cycling.

Symptoms

• Pump stops and displays E01 on the control panel.
• STATUS LED illuminates red steady.
• Fault signal relay activates on terminal pins 4 and 5 (single-phase) or 24 and 25 (three-phase).
• Pump cannot be restarted until error is cleared.

Common causes

• Transient internal communication fault between control board and drive module.
• Electrical noise or voltage spike disrupting the internal data bus.
• Failing or damaged internal PCB connection.

Diagnostic steps

1. 01

   Power down the pump

   Switch off the pump and disconnect from mains supply. Allow the unit to de-energize fully — wait at least 5 minutes before touching any internal components.

2. 02

   Restart and observe

   Restore mains supply and restart the pump. Monitor the display immediately — if E01 does not reappear, the fault was transient.

3. 03

   Check for electrical noise sources

   Inspect installation wiring for loose connections, improperly routed cables, or missing EMC measures. Ensure control cables are separated from power cables by at least 8 inches (200 mm).

4. 04

   Contact Xylem if fault persists

   If E01 returns after the 5-minute restart, the internal PCB or drive module requires factory-level diagnosis. Contact Xylem or an Authorized Distributor with the pump model, serial number, and error history from parameters P09–P12.

When to call a professional

Call a licensed technician if E01 returns after multiple restart attempts. Persistent internal communication failure indicates a failed control board or drive module — components that require specialized diagnostic equipment and factory-trained personnel to replace safely. Do not attempt to open the drive enclosure; dangerous DC-bus voltages persist for at least 5 minutes after power removal.