DeviceErrors
Error codeA:01

Bosch WVH28490AU Error Code A:01: Meaning, Fixes & Troubleshooting

BoschWasher-DryerWVH28490AUUpdated Apr 16, 2026Confidence: medium
Quick fix

Bosch WVH28490AU code A:01 usually means the washer-dryer cannot take in water correctly. Check the supply tap, inlet hose, and any filter or connection points before you rerun the appliance.

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SeverityLow
DifficultyEasy
DIY-safe (general)
Time~10 min / ~25 min
Quick fix · Full checks

Summary

Bosch WVH28490AU error code A:01 means door must be closed immediately because the water level is rising. This guide explains the likely causes, the safest first checks, and when support or service is the better next step.

Fix it fast

  1. Confirm the water supply is fully open and household water flow is normal.
  2. Check the inlet hose for kinks, damage, or blockages and clean any accessible inlet filter.
  3. Run a fresh cycle and confirm the appliance fills normally.

What A:01 means

Door must be closed immediately because the water level is rising. On the Bosch WVH28490AU, this code relates to the washer-dryer and should be interpreted together with how the appliance is behaving right now.

Common symptoms

  • The washer-dryer displays A:01 instead of normal status information.
  • The current cycle, function, or startup sequence may stop, pause, or behave differently than expected.
  • The same code may return after a reset if the underlying issue is still present.

Most likely causes

  • Water supply is restricted, shut off, or below the required pressure.
  • An inlet hose, filter, valve, or related connection is blocked, kinked, or installed incorrectly.

Deeper checks before service

  1. Check whether the fault started after installation, moving the appliance, or plumbing work.
  2. Make sure all inlet connections are seated correctly and not restricted.
  3. If the code returns after the basic supply checks, the inlet valve or level control may need service.

Safety warnings

  • Isolate water and power before disconnecting inlet hoses or fittings.

When to contact support

Book service if A:01 returns after the supply and inlet checks, or if there is visible damage to the hose, valve, or fittings.

FAQ

Can A:01 clear after a reset?
Sometimes a temporary glitch clears after one full reset, but a repeated return usually means the same underlying issue is still there.
Should I keep using the appliance if it works again briefly?
Only if the code stays away and the appliance behaves normally. If the same code comes back, stop and move to service or more targeted diagnosis.

What to record before Bosch support or repair

  1. Photograph the full display and the product label or rating plate.
    ExpectedYou can confirm the exact model and avoid support or parts quotes against the wrong product variant.
  2. Note whether the appliance was idle, starting up, heating, filling, draining, cooling, or finishing a cycle when the code appeared.
    ExpectedYou have the timing detail that usually matters most in fault triage.
  3. Write down any recent changes such as a power interruption, filter clean, leak, unusual noise, smell, moved installation, or repeated manual reset attempts.
    ExpectedSupport can separate a recent event from a longer-running repeat fault faster.

Next actions if A:01 keeps coming back

If A:01 returns after one clean restart and the user-accessible checks above, treat that as a repeat fault. The safest next move is to compare the model hub, confirm the official manual-safe checks for this device, and then escalate with a clear symptom record instead of opening panels or replacing parts blind.