Does the error return immediately? If yes, go to Step 2. If the vacuum runs now, you likely had a logic glitch.
The Philips SpeedPro Max uses a . These motors are incredibly powerful but rely on a circuit board (PCB) located directly above the dustbin. If water bridges the wrong circuit traces, the motor can spin uncontrollably or short out, potentially starting a fire. The E4 code is a "fail-safe" lockout mandated by UL safety standards (UL 1017 for vacuum cleaners).
