How do I perform the FlowSense installation check to verify my exhaust ductwork is clear?

Start with the machine in standby mode (power off), then press and hold both the DAMP DRY BEEP and TEMP. CONTROL buttons together while turning on the dryer with the POWER button simultaneously. The dryer will run for 2 minutes while checking temperatures, then display either YES (ductwork is free from blockages) or NO (a blockage needs to be removed immediately). The dryer must be at room temperature for this test to be reliable. (Page 20)