What E01 Means
E01 means the dishwasher's heating system failed to bring the water up to the programmed temperature within the expected time window, so the cycle can't proceed normally.
Common Causes of E01
- Failed heating element
- Faulty NTC temperature sensor
- Control board relay failure
- Incoming water supply too cold
🔧 One Safe Check You Can Try
Run your kitchen hot water tap until it runs hot before starting the dishwasher — Bosch dishwashers expect an incoming supply of at least 120°F, and a cold-start fill is a common false trigger for E01.
⚠ Why You Shouldn't Go Further Than That
- Testing the heating circuit while powered means working near a live 120V element sitting in a wet tub — a real shock risk.
- A cold-water false trigger looks identical to a real heating-element failure, and replacing the element when the real issue is the water supply is a common, expensive misdiagnosis.
- The NTC sensor and heating relay share the same wiring harness — disturbing one while testing the other can introduce a second fault.
- Reassembling the lower access panel incorrectly can pinch a wire against the tub, causing an intermittent short later.
- Opening the base access panel to test the heating circuit is one of the most common ways this warranty gets voided.
Still Seeing E01?
Book a factory-trained technician and get it diagnosed correctly the first time — no guesswork, no repeat visits.