What Does Error Code E36 Mean on a Siemens Washing Machine?
Check the AquaStop inlet hose connection at both the tap and the machine for visible leaks or kinks, tighten any loose fittings, and restart the machine — if the hose was the cause, the error should clear immediately (takes about 10 minutes).
Fault description
Error E36 is Siemens' way of telling you that its AquaStop safety system has been triggered. AquaStop is a dual-layer flood-protection hose that contains a built-in valve — if water is detected leaking inside the outer sleeve of the hose, or if the machine's internal leak sensor detects water in the base tray, the valve shuts off the water supply automatically and the E36 code appears on the display.
When this error occurs, the machine will stop mid-cycle and refuse to start a new programme. The water supply is cut at the hose itself, so the drum may still contain water that needs to be drained before you can investigate further. This is a safety feature, not a nuisance — it is actively preventing a flood in your home.
The fault can originate from the AquaStop hose itself, from a loose or damaged connection, or from a genuine internal leak caused by a failed component such as a door seal, pump, or hose inside the machine.
Causes
- Damaged or triggered AquaStop hose — The AquaStop hose contains a moisture sensor in its outer sleeve. If the inner hose has developed a small crack or pinhole, water enters the sleeve and triggers the valve, cutting supply and raising E36.
- Loose hose connection at the tap or machine inlet — A poorly tightened or slightly dislodged connection at either end of the inlet hose can allow water to seep into the AquaStop sleeve. This is one of the most common causes and is easy to check without tools.
- Water in the base tray from an internal leak — A leak from the door seal, drum bearings, internal hoses, or the pump can allow water to collect in the plastic base tray beneath the drum. A float switch in the tray rises with the water level and triggers E36.
- Failed or cracked door seal (door gasket) — The rubber door gasket can develop tears or splits over time, especially along the bottom where water pools. Even a small split can direct water into the base tray during a wash cycle.
- Leaking internal hose or pump — The hoses connecting the drum, pump, and dispenser drawer can loosen or perish with age. A dripping pump seal or cracked pump housing will also deposit water into the base tray and trigger the float switch.
- Faulty AquaStop valve or float switch — In rare cases the AquaStop valve mechanism itself can fail in the closed position, or the float switch in the base tray can stick in the raised position, causing E36 to appear even when no actual leak is present.
Step-by-Step Fix
- 1
Switch off and unplug the machine
Turn the programme dial to off and unplug the machine from the mains before doing anything else. This is essential when water and electrics may be involved. Leave it unplugged throughout your inspection.
- 2
Inspect the AquaStop inlet hose
Pull the machine slightly away from the wall and examine the entire length of the AquaStop hose. Look for visible cracks, bulging, or damp patches on the outer sleeve. Check that the fittings at both the tap end and the machine inlet are hand-tight and seated squarely. Tighten any loose connections with a cloth for grip — do not use pliers on the plastic fittings.
- 3
Drain any remaining water from the drum
Open the small access flap at the bottom front of the machine to locate the drain filter. Place a shallow tray and some towels underneath, then slowly unscrew the filter cap to let the water drain out. Once empty, remove and clean the filter of any debris before replacing it securely.
- 4
Tilt the machine and check the base tray
With the machine unplugged and empty, carefully tilt it backwards about 15 degrees and hold it there for 30 seconds. This allows any water sitting in the base tray to drain out through the front. If a significant amount of water pours out, there is an internal leak that needs to be traced. Tilting also resets the float switch if it was stuck in the raised position.
- 5
Inspect the door seal for damage
Open the door and run your fingers around the full circumference of the rubber door gasket, paying close attention to the bottom section. Look for tears, splits, or areas where the seal has pulled away from the drum rim. Even a small split can cause enough leakage to trigger E36 during a wash cycle.
- 6
Check internal hoses and the pump (with back panel removed)
If you are comfortable doing so, remove the rear panel of the machine (usually held by two or three screws). Inspect the visible hose connections for dampness, mineral deposits, or cracks. Check the pump housing for signs of dripping. Do not force any connections — if something looks corroded or brittle, note it for a service technician.
- 7
Reconnect and run a short test cycle
Once you have addressed any visible issues, reconnect the machine, restore the water supply, and run a short 30-degree cotton cycle while watching for any drips at the back or underneath. If E36 does not return and no leaks are visible, the fault has been resolved. If the code reappears, the source of the leak has not yet been found and professional diagnosis is needed.
Affected models
Select your model to see its full troubleshooting page.
When to call a service technician
If you have drained the base tray, tightened all hose connections, and inspected the door seal but E36 returns as soon as you run a cycle, there is an internal leak that requires the machine to be partially dismantled to locate. Leaks from drum bearings, the pump seal, or the pressure chamber are not safely accessible without experience and the correct tools.
You should also call a service technician if the AquaStop hose itself is damaged — this is a safety-critical component and must be replaced with a genuine Siemens-approved part, not a generic hose. Similarly, if the float switch appears to be faulty (E36 appears with a completely dry base tray), a technician will need to test and replace it correctly.
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Frequently Asked Questions
Can I reset error E36 on my Siemens washing machine?
You can attempt a reset by unplugging the machine for two minutes and then tilting it backwards to drain the base tray float switch. However, if there is still water in the base tray or an active leak, the error will return as soon as you run a cycle. A reset only works long-term once the underlying cause has been fixed.
Is it safe to use my Siemens washing machine while it shows E36?
No. E36 means the AquaStop system has detected a potential flood risk and has shut off the water supply as a precaution. Running the machine in this state could result in water damage to your home. Leave it switched off until the fault has been identified and resolved.
How do I know if the AquaStop hose needs replacing?
If the outer sleeve of the hose feels damp, looks discoloured, or has any visible cracks, it should be replaced. Even if it looks fine externally, a hose older than five to seven years is worth replacing as a precaution, since the inner hose can degrade without obvious external signs. Always use a genuine Siemens AquaStop hose.
Why does E36 appear even though I cannot see any water leaking?
The leak may be very small and only occurs under pressure during a wash cycle, making it hard to spot during a static inspection. It is also possible that the float switch in the base tray has stuck in the raised position after a previous leak event. Tilting the machine to drain the tray and then running a cycle while watching carefully underneath will usually reveal the source.
How much does it cost to fix a Siemens E36 error?
If the fix is simply replacing the AquaStop inlet hose, the part typically costs between £20 and £50 and can be fitted in under 15 minutes. A door seal replacement is a moderate DIY job with parts usually costing £20 to £60. If the fault requires a service technician to trace and repair an internal leak, expect a call-out fee plus parts, which can range from £80 to £200 depending on the component involved.