What Does Error Code E37 Mean on a Siemens Washing Machine?
Turn off the machine at the mains, wait 10 minutes to allow the pressure switch to reset, then restart the cycle — if the fault was a temporary pressure switch glitch, the machine should resume normally (takes about 10 minutes).
Fault description
Error code E37 is an overfill protection fault. The machine's pressure switch — the component that monitors water level inside the drum — has either reported a level that is too high, or has failed to send a reliable signal to the control board. When this happens, Siemens washing machines are designed to stop the cycle immediately to prevent water from spilling out of the drum or damaging internal components.
When E37 appears, you will typically notice the machine has paused mid-cycle, the door remains locked, and in some cases the pump may run continuously as the machine attempts to drain excess water. The drum may feel unusually heavy, or you may see water sitting higher than normal through the door glass.
The fault points to one of two main systems: the pressure switch (also called a pressure sensor or water level sensor) or the water inlet valve. Both are reachable with basic tools, and many cases can be resolved without calling a service technician.
Causes
- Faulty or blocked pressure switch — The pressure switch reads water level via a small plastic hose connected to the drum. If this hose is kinked, blocked with detergent residue, or the switch itself has failed, the machine receives an incorrect water level reading and triggers E37.
- Inlet valve stuck open or not closing fully — The water inlet valve controls the flow of water into the drum. If the valve solenoid fails or debris holds the valve partially open, water continues to enter even after the target level is reached, causing genuine overfilling.
- Blocked or kinked pressure switch hose — The narrow rubber or plastic hose running from the drum to the pressure switch can become clogged with limescale or detergent build-up over time. A partial blockage causes inaccurate pressure readings without the switch itself being defective.
- Control board fault — In less common cases, the main PCB may misinterpret signals from the pressure switch or fail to cut power to the inlet valve at the correct time. This is usually only suspected after the pressure switch and valve have been ruled out.
- Excessive detergent causing foam — Using too much detergent, or a non-HE detergent in a high-efficiency machine, generates foam that the pressure switch can read as excess water. This can trigger E37 even when the actual water volume is within normal limits.
Step-by-Step Fix
- 1
Switch off and drain the machine
Turn the machine off at the mains socket and leave it for 10 minutes. If water is visible above the door seal, place towels around the base and use the emergency drain hose (usually found behind the filter cover at the front bottom of the machine) to drain manually before proceeding.
- 2
Restart and observe
After the rest period, switch the machine back on and run a short cotton cycle. Watch whether water continues to fill beyond the normal level. If the machine completes the cycle without E37 returning, the fault was likely a temporary pressure switch glitch.
- 3
Check your detergent quantity
Reduce detergent to the minimum recommended dose for your water hardness and load size. Run a drum-clean or empty hot cycle to flush out any foam residue. Always use detergent labelled suitable for high-efficiency (HE) front-loading machines.
- 4
Inspect and clear the pressure switch hose
Pull the machine out and remove the top panel (usually two screws at the rear). Locate the pressure switch — a small round component, typically on the left or right side near the top, with a thin hose leading down to the drum. Disconnect the hose, blow gently through it to check for blockages, and wipe the inside with a damp cloth. Reattach securely and test.
- 5
Test the pressure switch
With the top panel still off, disconnect the electrical connector from the pressure switch. Use a multimeter set to continuity mode to test across the switch terminals while blowing gently into the hose port — you should hear a click and see continuity change. A switch that shows no change is faulty and needs replacing.
- 6
Inspect the inlet valve
Turn off the water supply to the machine. Disconnect the inlet hose at the back and check the mesh filter inside the valve inlet for debris — clean it with a soft brush under running water. If the valve solenoid is suspected of sticking open, you can test resistance across each solenoid coil with a multimeter; a reading outside the 200–500 ohm range typically indicates a failed coil.
- 7
Replace the faulty component and retest
If either the pressure switch or inlet valve has tested as defective, fit a compatible replacement part (see spare parts section below). Reassemble the machine, restore the water supply, and run a full cycle to confirm E37 does not return before pushing the machine back into position.
Affected models
Select your model to see its full troubleshooting page.
When to call a service technician
If you have replaced both the pressure switch and the inlet valve and E37 continues to appear, the fault is likely within the main control board. PCB diagnosis and replacement requires specialist equipment and carries a risk of further damage if handled incorrectly — this is the point to book a service technician rather than continue with DIY repairs.
You should also call a service technician immediately if you notice water pooling under or around the machine during the fault, if the machine will not power off when the mains switch is pressed, or if you can smell burning near the control panel. These symptoms suggest a more serious electrical or valve failure that should not be left unattended.
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Frequently Asked Questions
Can I still use my washing machine while it shows E37?
No — you should not run the machine while E37 is active. The error exists to prevent overfilling, which can cause water damage to the machine's electronics and your home. Resolve the fault before running another cycle.
How do I know if the pressure switch or the inlet valve is the problem?
If the machine fills to a normal level but still shows E37, the pressure switch or its hose is the more likely culprit. If you can see or hear water continuing to enter the drum beyond the normal fill point, the inlet valve is the more probable cause. Testing both with a multimeter as described in the steps above will give you a definitive answer.
Will using less detergent really fix an E37 error?
In some cases, yes. Excess foam generated by too much detergent can fool the pressure switch into reading a higher water level than actually exists. If E37 appears mainly on heavily loaded or heavily soiled washes, try cutting your detergent dose by a third and running a drum-clean cycle first.
How long does it take to replace a pressure switch on a Siemens washing machine?
For most Siemens models, replacing the pressure switch takes around 30 to 45 minutes with basic tools. The main steps are removing the top panel, disconnecting the hose and electrical connector, swapping the switch, and reassembling. No specialist tools are required beyond a screwdriver and possibly a pair of pliers.
Is E37 covered under a Siemens warranty or appliance insurance?
If your machine is within the manufacturer's warranty period, contact Siemens customer support before attempting any repairs yourself, as DIY work can void the warranty. If you have a home appliance insurance policy or a service plan, check whether electrical faults such as a failed pressure switch or inlet valve are included before booking an independent service technician.