For anyone who has purchased one of these new diffusers.. I recently encountered an issue with mine after 2/3 weeks use. They started to smell as if they were burning - so I removed them and contacted Beaphar yesterday. They responded quickly: We have consulted our technical department regarding the problem that you have encountered. They have advised that occasionally, if the wick contained within the unit is not in the correct position (either too high or not completely vertical) and the oil on it comes into contact with the ceramic plate, then this can cause a burning smell. This can be rectified by re-positioning the wick (see attached diagram). - Unscrew the refill - Push the wick gently down until it touches the bottom of the bottle - Wipe off any traces of oil and then screw the refill back into the plug unit The product is completely safe to use and repositioning of the wick should resolve any issues. Have done what they suggested and pushed the wick down to the bottom of the bottle. Plugged back in so just a case of wait and see. Up until the smell I was quite impressed with the product. Just hope this solves the problem.