My Festool mitre saw was running slowly and intermittently after being rained on. After leaving a request for technical help, Goran in UK engineering called me back, and we solved the problem together (I'm an engineer too). Marvellous service which avoided me needing to send a big, awkward tool back for repair. For others who have this problem: there's a thermistor on top of the motor (look for the two red wires), surrounded by a short length of shrink-fit, and set in a blob of white thermal paste. It's open to rain getting into the shrink-fit tube, which changes the resistance, presumably making the electronics think the motor has overheated, and so commanding protection mode. Note to Festool: After drying out the component with applied heat, I sealed the top of the thermistor housing with silicone, preventing any more water getting in there, solving the problem. Maybe this sealing should be done at the factory. The shrink-fit tube points directly up at the sky, and sometimes it rains on building sites!
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