''TEMP Sensor ERR'' on your E+ display means there is a problem with the outlet sensor. Check the outlet sensor for damage (it is the black sensor on the outlet grill) and replace if required. Please view and order a replacement sensor online if needed at this link: https://www.reznor.co.uk/product/e-thermistor/. 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.
What does 'TEMP Sensor ERR' mean on the E+ display?
Information on Reznor's range of warm air heaters