Troubleshooting My Philips Iron does not heat up and a light is blinking If you notice your Philips Steam Iron does not heat up and a red or blue iron is blinking, please read here about it. The steam iron is in Auto switch-off If your iron is left unused horizontally for more than 30 seconds, or vertically (heel rest) for more than 8 minutes, it switches off automatically for safety reasons. When this happens, the heating up light flashes. Move the iron to turn the iron on and it will start heating. The steam generator iron is in Auto switch-off If your Philips Steam Generator is not used for 5 to 10 minutes (depending on your model), it switches off automatically, and the auto shut-off light (in the on/off button) starts to flash. To activate your steam generator again, press the on/off button and it will start heating.