Magstim FAQ 12
12. What does the orange light on the Booster Module mean?
If the orange LED on the Booster module is illuminated it means that the high voltage Transformer inside the Booster Module has over heated.
Leave the Booster switched ON so that the fan in the Booster cools the Transformer quickly.
This may happen after the Booster is used for a long train of stimulations.
