If the E+ doesn't have heat or fan operation, check the 3 phase power supply to the unit and also check if display settings are correct (heat demand). Please refer to the E+ electric unit heater installation manual (https://www.reznor.co.uk/wp-content/uploads/2024/08/Reznor-e-Installation-Manual-EN-2024-06-D301600-Iss-0-print-quality-1.pdf) for more information.
Why is my E+ display working but there's no heat or fan operation?
Information on Reznor's range of warm air heaters