Troubleshooting The steam boost of my Philips steam iron is not working Read on to find out why the steam boost of your Philips steam iron is not working and how to activate it. Steam irons: The steam boost trigger has not been pressed and released To activate the steam boost of your Philips steam iron, press and release the steam boost trigger. Please note: Steam boost is not available at the 1 dot and 2 dot temperature settings. Steam irons: The steam boost function has been used too often When you use the steam boost function too often within a short period of time, the steam boost function will stop working for a while. In this case, please wait a couple of minutes until the steam boost can be used again. Steam generator irons: The steam trigger was not pressed twice quickly To activate the steam boost of your Philips steam generator iron, press the steam trigger twice quickly. To deactivate it, just press the trigger again once.