The CEC102040MC-F is a simple and credit card sized EC Temperature Controller provides closed loop, temperature sensitive speed control for the full range of EC fans. Its patented design connects to the 10VDC output from the EC fan motor and requires no additional power supply. The controller regulates fan speed between 0 and 100% against a pre-programmed temperature profile and also incorporates a combined fan fail, sensor fail and over-temperature alarm. Under alarm conditions the controller fails safe to demand maximum fan speed.