If the indicator light on the processor unit is flashing red, the fan is making a loud noise or you see a message related to overheating on screen, it may be in danger of overheating. You can take a few simple steps to minimise the risk of overheating.
Place the processor unit in a well-ventilated area.
Carefully use a dry cloth and occasionally a vacuum to keep the processor unit free from dust. The microfiber cloth supplied with the PS VR is for cleaning the headset lenses, don't use it to clean the processor unit.
Make sure there is enough slack in the cable between the VR headset and the processor unit.
Place the unit as far away as possible from other devices.