That is a service light and means there is some type of failure. If this tool is under warranty I would call 1-800-879-8000 and see about getting repaired. If not go to Hilti.com and download a breakdown for this tool. You might want to check the brushes first for wear because they have a sensor that triggered the light.
Hi, The TE50 is a fairly new SDS Max machine released from Hilti in the last 24 - 30 months. The red light is a service indicator light which comes on when a services is due. After 10 hours of working time after the light comes on, the machine automatically turns off to protect the motor and gears and usually brushes need replacing. The warranty on the machine is 2 years no cost, so you should not be in for a supprise bill should the machine be under this time. Hope this helps.
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