What Does Error Code E65 Mean on a Siemens Washing Machine?
Check and clean the filter, then run a short 60°C cotton cycle to confirm the machine heats correctly — if E65 clears, a blocked filter was restricting water flow to the heater (takes about 10 minutes).
Fault description
Error code E65 points to a problem in your Siemens washing machine's heating circuit. This circuit is responsible for raising the water temperature to the level you select on the dial or display. When the machine's control board detects that the water is not reaching the expected temperature within a set time — or that sensor readings are outside a safe range — it stops the programme and displays E65 to prevent damage.
When this error appears, the wash cycle will typically pause or abort mid-programme, often during the main wash phase when heating is most active. You may notice that clothes come out cold or that the machine stops shortly after filling with water. The drum may still turn, but no heating takes place.
The fault can stem from a failed heating element, a faulty NTC temperature sensor, damaged wiring, or in some cases a problem with the control board itself. Most of these causes are diagnosable at home, and several can be resolved without specialist tools.
Causes
- Faulty NTC temperature sensor — The NTC (Negative Temperature Coefficient) sensor monitors water temperature and feeds readings back to the control board. If it fails or drifts out of calibration, the board cannot confirm that heating is occurring and triggers E65.
- Failed or burnt-out heating element — The heating element is the component that physically warms the water. Over time, limescale build-up or electrical stress can cause it to fail, meaning the water never reaches the target temperature and the fault is logged.
- Limescale build-up on the heating element — In hard water areas, calcium deposits coat the heating element and reduce its efficiency significantly. The element may still function but heat so slowly that the control board times out and raises E65 before the target temperature is reached.
- Wiring or connector fault — The wires and connectors linking the heating element and NTC sensor to the control board can corrode, loosen, or chafe over time. A poor connection produces intermittent or incorrect signals that the board interprets as a heating circuit failure.
- Blocked pump filter restricting water level — If the filter is heavily blocked, water may not fill to the correct level around the heating element. The element can then overheat or fail to register a temperature rise, contributing to an E65 fault.
- Control board fault — In a small number of cases, the main PCB itself is unable to correctly drive the heating circuit or read sensor data. This is usually only confirmed after all other components have been tested and found to be in good condition.
Step-by-Step Fix
- 1
Clean the pump filter
Locate the filter access panel at the bottom front of the machine. Place a towel and shallow tray underneath, then unscrew the filter cap slowly to drain residual water. Remove any debris, rinse the filter under a tap, and refit it securely. Run a short hot cycle to see if E65 clears.
- 2
Power cycle the machine
Switch the machine off at the mains socket and leave it unplugged for at least 5 minutes. This allows the control board to fully reset. Plug back in, select a 60°C programme, and observe whether the machine heats normally and completes the cycle without displaying E65.
- 3
Run a descaling cycle
If you live in a hard water area and have not descaled the machine recently, add a proprietary washing machine descaler to the drum (following the product instructions) and run a hot empty cycle at 90°C. Limescale on the element is a very common cause of slow or failed heating, and a descale can restore normal performance.
- 4
Inspect the wiring to the heating element and NTC sensor
Disconnect the machine from the mains before doing this. Pull the machine forward and remove the rear panel (usually held by two or three screws). Locate the heating element at the base of the drum and the NTC sensor clipped nearby. Check that all connectors are firmly seated, look for signs of burning, corrosion, or chafing on the wires, and reseat any loose connectors. Refit the panel and test.
- 5
Test the NTC temperature sensor with a multimeter
With the machine unplugged and the rear panel removed, disconnect the NTC sensor's connector and measure its resistance with a multimeter. At room temperature (around 20°C) a healthy NTC sensor typically reads between 4,000 and 6,000 ohms. A reading of zero or infinity indicates a failed sensor that needs replacing.
- 6
Test the heating element for continuity
With the machine still unplugged, disconnect the two spade connectors from the heating element terminals. Set your multimeter to the resistance (ohms) setting and touch the probes to the two terminals. A working element typically reads between 20 and 50 ohms. A reading of infinity (open circuit) confirms the element has failed and must be replaced. Also test between each terminal and the machine's metal body — any reading here indicates an earth fault.
- 7
Replace the faulty component
If your testing has identified a failed NTC sensor or heating element, source the correct replacement part using your machine's full model number (found on the label inside the door frame). Both parts are generally straightforward to swap with basic tools. After fitting, run a full 60°C cycle to confirm the fault has cleared before returning the machine to normal use.
Affected models
Select your model to see its full troubleshooting page.
When to call a service technician
If you have tested both the NTC sensor and the heating element and both measure within normal ranges, but E65 continues to appear, the fault is likely within the control board itself. PCB diagnosis and replacement requires specialist equipment and knowledge of board-level electronics — this is not a safe DIY repair.
You should also contact a service technician if you find burnt wiring, a visibly damaged element, or any sign of water ingress near electrical components. Attempting to repair burnt or water-damaged wiring without proper training carries a real risk of electric shock or fire.
Spare parts and service
Visit our partners for spare parts and service
Spare parts
Book a repair
Frequently Asked Questions
Can I still use my Siemens washing machine while it shows E65?
It is not advisable. When E65 is active, the machine is not heating the water, which means laundry will not be properly cleaned or hygienically washed. Running repeated cycles without heat also puts unnecessary strain on the motor and pump. Resolve the fault before returning the machine to regular use.
How do I know if it is the heating element or the NTC sensor that has failed?
Testing both with a multimeter is the most reliable way to tell them apart. The NTC sensor should show a resistance reading in the thousands of ohms at room temperature; the heating element should show a low resistance of 20–50 ohms. A reading of infinity on either component confirms it has failed. If both test correctly, the wiring or control board is the more likely culprit.
Is E65 always a heating fault, or could it be something else?
On Siemens machines, E65 is specifically associated with the heating circuit, so the fault will always relate to heating, temperature sensing, or the electrical connections between those components and the control board. It is not triggered by drum, door, or drain faults, which have their own separate error codes.
How much does it typically cost to fix an E65 error?
If you replace the NTC sensor yourself, parts usually cost between £10 and £25. A replacement heating element typically costs £20–£50 depending on the model. If you call a service technician, expect to pay a call-out fee plus labour on top of the part cost. Control board replacement is the most expensive outcome and may not be economical on older machines.
Will descaling really fix an E65 error?
It can, particularly if the machine has been used in a hard water area for several years without descaling. Heavy limescale insulates the element and slows heating to the point where the control board times out and logs E65. A thorough descale at 90°C can restore the element's efficiency and clear the fault, though a severely scaled element may need replacing regardless.