The E01 error on your Bosch Dishwasher means the appliance has detected a water inlet or aquastop fault, usually linked to water flow into the machine taking too long or not being detected at all. This is often caused by a blocked filter, a kinked hose, or a faulty water inlet valve, and it can usually be checked and cleared without calling an engineer.
| Error code | E01 |
|---|---|
| Meaning | Water inlet fault — the dishwasher is not detecting water entering the tub within the expected time |
| Severity | Medium — the dishwasher won't start a cycle properly until this is resolved |
| Time to fix | 15–40 minutes |
| Tools needed | Adjustable spanner, towel, torch (optional) |
What the E01 error means
Bosch dishwashers use sensors to check that water is flowing into the tub at the correct rate when a cycle starts. If the sensor doesn't detect enough water within a set time window, it triggers the E01 code to stop the cycle and protect the machine from running dry.
This is a safety feature rather than a sign of serious damage in most cases. It's most often traced back to something restricting water flow — a closed tap, a clogged filter, or a valve that's stuck or worn out.
Common causes
- Water supply tap to the dishwasher is partly or fully closed
- Inlet filter or mesh screen is blocked with limescale or debris
- Water inlet hose is kinked, trapped, or has an air lock
- Faulty water inlet valve that isn't opening fully
- Low household water pressure affecting flow rate
- Aquastop safety device has triggered due to a detected leak
How to fix the E01 error
- Check the water supply tap — Make sure the tap feeding the dishwasher is fully open. A partly closed tap is one of the most common causes of this error.
- Inspect the inlet hose — Pull the dishwasher out carefully and check the hose isn't kinked, twisted, or trapped behind the unit. Straighten it out if needed.
- Clean the inlet filter — Disconnect the hose from the tap end (have a towel ready) and check the small mesh filter for limescale or debris. Rinse it under running water and refit.
- Test water pressure — Run the tap into a bucket to check flow is steady and strong. Weak pressure from the mains can also trigger this fault.
- Check for aquastop leaks — Look underneath the dishwasher for any pooling water, which may mean the aquastop safety valve has shut off the supply due to a detected leak.
- Reset the dishwasher — Turn off at the wall, wait two minutes, then restart. If the error clears, run a short test cycle to confirm the fix has worked.
Water inlet issues share some similarities with other appliance faults where flow, connections, or worn parts cause a shutdown — the same troubleshooting logic that applies to plumbing checks also carries over when working with other Bosch tools around the house, such as diagnosing a Bosch Drill Won'T Start: Causes and How to Fix It issue or checking connections when a Bosch Drill Battery Not Connecting: Causes and How to Fix It problem occurs. Loose or blocked connections are a recurring theme across Bosch appliances and tools alike.
FAQ
Can I keep using my dishwasher if it shows E01?
No, the dishwasher won't run a full cycle properly until the water inlet fault is cleared, since it needs a confirmed water supply to continue.
Does E01 mean the inlet valve needs replacing?
Not always. Most cases are caused by a blocked filter, closed tap, or kinked hose. A valve replacement is only needed if these checks don't resolve the fault.
Is the E01 fault covered under warranty?
If your dishwasher is still within its warranty period and the cause is a faulty part like the inlet valve, it's worth contacting Bosch support before attempting a DIY repair.
