The following information is for anyone who may have problems with the temperature controller for Solent Scientific incubation systems (e.g. the unit is on but the heater doesn't warm the chamber). Often problems can be traced to one of the four fuses (FS1 to FS4) in the controller. There is a link below to a PDF of Solent's own guide for testing the fuses, as well as a couple of images showing what they look like when the controller has been opened (note that these are the 240 VAC versions; the 110 VAC ones will look different). Thanks to Orry Dugdale at Solent Scientific for the PDF and Jan Soetaert at QMUL for the original photos.