Bosch Washing Machine Error Codes Explained for Addlestone Homeowners

Published September 2026 | Bosch Washing Machine Error Codes

This guide covers the most common Bosch washing machine error codes, what they mean, and what you can safely do at home to diagnose and fix them. It's aimed at homeowners in Addlestone and across Surrey who want to understand exactly what their machine is telling them before deciding whether to reach for a phone or a screwdriver.

Before You Start - Safety First

Before you touch anything on the machine, turn it off at the wall and unplug it. This isn't just habit - washing machines combine high voltage with large volumes of water, and that combination demands respect. If your Bosch is displaying an error that involves water - a fill fault, a drain fault, or a leak warning - don't just hit reset and restart the programme. Walk around the machine first and check the floor for standing water.

Bosch machines (along with other brands like Samsung, LG, Hotpoint, and Beko) have built-in safety systems that trigger error codes to protect both the appliance and your home. If you see water pooling underneath the machine, your Bosch may have activated its AquaStop system - a flood protection feature that cuts off the water supply when a leak is detected. Do not attempt to move the machine or mop up while it's still plugged in. Soak up the water, find where it came from, and then decide your next move.

If there's any possibility water has reached electrical components inside the machine, stop and call a professional. Also bear in mind that if the cycle failed mid-wash, there may still be water inside the drum. Run a drain-only programme if the machine allows it, or access the emergency drain via the filter cover (typically a small flap at the bottom front of the machine) and bail it out manually before you start investigating.

What You Will Need

Most error code investigations don't require specialist tools, but having the right things to hand before you start will save you several trips back to the kitchen cupboard.

• A flat-head and Phillips screwdriver
• A small bucket and several old towels
• Needle-nose pliers (useful for hose clips and small filters)
• A multimeter (only needed if you're testing sensors or heating elements)
• Your Bosch washing machine model number - printed on a sticker inside the door seal or on the back panel
• Access to the Voltrade GoFIX diagnostic tool, which can help you identify the specific fault for your model before you start opening anything up

Time estimate: Basic checks - water supply, drain filter, door latch - typically take between 15 and 30 minutes. If you're going further into hoses, pump inspection, or internal components, allow 45 to 60 minutes and make sure you have enough space to pull the machine away from the wall safely.

Step-by-Step Instructions

Step 1: Read and Record the Error Code Accurately

Bosch washing machines use two main code formats depending on model and age: E-codes and F-codes. Older Bosch machines - typically those made before around 2015 - commonly display E-codes such as E17, E18, or E02. Newer models in the Series 4, 6, and 8 ranges tend to show F-codes: F17, F18, F02. In most cases, the E and F versions of the same number describe the same fault, so E18 and F18 both point to a drain problem. Some models also use letter-number codes like d04, which indicates a door fault.

Write the code down before you do anything else. Resetting or unplugging the machine will clear the display, and you'll want the exact code to look up. If you're unsure which code format your specific model uses, enter your model number into the Voltrade GoFIX tool to get a tailored fault list before you proceed.

Step 2: Try a Hard Reset Before Investigating Further

Some error codes are triggered by a momentary sensor glitch, a brief power surge, or a one-off communication error between the machine's components. Before you start dismantling anything, give the machine a proper hard reset. Turn the programme dial to the off position, unplug from the wall, and leave it for a full two minutes. Plug back in and run a short programme to see if the code returns. If it doesn't come back, monitor the machine over the next couple of washes. If the code reappears, move on to diagnosing the specific fault below.

Step 3: Water Inlet Faults - E17 or F17

E17 and F17 mean the machine isn't receiving enough water, or water is taking too long to reach the drum. Start with the basics: check that the water supply tap behind the machine is fully open. In many older Surrey homes, isolation valves on appliance supply pipes can stiffen over time and get partially closed without anyone noticing - it's one of the first things our engineers check.

If the tap is fully open, the next step is to clean the inlet filter. Turn off the supply tap, unscrew the cold water inlet hose from the back of the machine, and look inside the fitting at the machine end. There's a small mesh filter here. Remove it carefully with pliers, rinse it under a running tap to clear any sediment or debris, and refit. Also check along the full length of the hose for kinks. Low water pressure in your local area can also trigger this code - if neighbours in Addlestone are experiencing similar issues at the same time, contact your water supplier before assuming it's the machine.

Step 4: Drain Faults - E18, F18, E02, F02

Drain faults are among the most common codes that engineers see on Bosch machines. E18 and F18 indicate the machine failed to drain within the expected time. E02 and F02 are closely related but typically point more directly to a blocked or failed pump.

Always start with the drain filter. On most Bosch front-loaders it sits behind a small cover panel at the bottom right of the machine. Lay a towel down, put the bucket under the panel, and unscrew the filter cap slowly to let the water drain out in a controlled way. Small objects - coins, buttons, hair grips, even a child's sock - lodge here and stop the pump turning freely. Clean the filter thoroughly, check inside the housing for any remaining debris, and refit firmly.

Next, check the drain hose at the rear of the machine. It should exit the machine, curve gently upward, and sit inside the standpipe or connect to the sink waste. If the hose is pushed too far into the standpipe (more than around 15 centimetres), it can create a siphoning effect that drains water as fast as the machine fills - triggering repeated drain errors even with a perfectly working pump. Pull it out slightly and secure it at the correct depth.

Step 5: Door Lock Faults - E43, F43, d04

A door error means the machine either can't confirm the door is properly closed (d04) or the door interlock mechanism has failed (E43 or F43). Open the door, check that nothing - a label, a sock, a build-up of detergent residue on the seal - is preventing a clean close, and try shutting it firmly. Inspect the rubber door seal for cracks or foreign objects that might stop the door seating flush.

If the door closes normally but the code keeps returning, the interlock itself has likely failed. This is the small plastic and electrical mechanism that clicks the door shut once a programme starts. On Bosch machines, a replacement door interlock typically costs between 15 and 35 pounds for the part. Fitting it yourself is achievable on most models but requires removing the door seal to get access - a 30 to 45 minute job if you're comfortable working inside the machine. If you're not, it's one of the more affordable repairs to have done professionally.

Step 6: Heating and Temperature Faults - E60, F60, E61, F61

These codes indicate a problem with the heating circuit. E60 and F60 typically mean the water isn't reaching the target temperature within the expected time, while E61 and F61 can suggest overheating or a sensor reading that's drifted out of range. The two most common culprits are the NTC temperature sensor (a small probe that monitors water temperature) and the heating element itself.

An NTC sensor is a relatively inexpensive part - typically between 10 and 20 pounds - and can be accessed on most Bosch machines by removing the rear panel. A failed heating element is a bigger job. Elements on Bosch washing machines typically cost between 25 and 60 pounds for the part alone, with a total repair bill of around 100 to 180 pounds including labour if you use a qualified engineer. Before replacing either component, use a multimeter to test resistance on the sensor and continuity on the element - this confirms the fault rather than guessing.

Step 7: Reset, Test, and Monitor

Once you've addressed the underlying fault - cleaned the filter, replaced a part, cleared a blocked hose - run a short test cycle before considering the job done. Use a 30 or 40 degree cotton programme with a small load and stay nearby for the first ten minutes. Confirm the machine fills correctly, locks the door, heats the water, and drains without triggering the same code. If it completes without issue, run one further full cycle before returning to your normal wash routine. Some faults intermittent by nature, so it's worth keeping an eye on the machine across the next few washes.

What to Do If This Does Not Fix It

If the error code returns after working through the steps above, the fault is likely deeper than a blocked filter or a sensor reset. Possible causes at this stage include a failed control module (the electronic board that manages every function of the machine), worn motor brushes on older Bosch models, or a wiring fault that's intermittently triggering a sensor error incorrectly. These faults require component-level testing with a multimeter or specialist diagnostic equipment - they're not typically resolvable with visual inspection alone.

It's worth running your model number and fault code through the Voltrade GoFIX tool at this point to get a clearer breakdown of likely repair costs before committing to a call-out. On machines that are more than eight years old, the repair cost for a control board or motor fault can sometimes approach the cost of a replacement machine, and it's useful to have that information before making a decision. A mid-range Bosch washing machine in the UK commonly starts at around 350 to 500 pounds, which gives you a useful benchmark for repair value.

When to Stop and Call a Professional

Some faults fall outside the safe scope of DIY repair. Call a qualified appliance engineer if any of the following apply:

• You're seeing E23 or F23 - this means the AquaStop flood protection has activated, indicating a leak inside the machine that needs to be properly located and repaired
• The machine displays E27 or F27, which relates to voltage or power supply issues - this could indicate a control board fault or a problem with the mains supply that's outside safe DIY territory
• You've replaced a component and the same code returns - this usually means the fault was misdiagnosed and a second component is involved
• There's a burning smell, visible scorch marks anywhere on the machine, or the appliance trips your fuse board when switched on
• Your machine is still under Bosch's manufacturer warranty - DIY repairs can invalidate cover, so contact Bosch directly first

In Addlestone and the surrounding parts of Surrey, a typical appliance repair call-out costs between 60 and 100 pounds to diagnose, with the repair itself adding further depending on the fault and parts required. A control board replacement on a Bosch machine commonly runs between 180 and 300 pounds all-in. For machines over a decade old, our engineers in Addlestone will often advise homeowners to weigh that cost against the price of a new appliance before proceeding - it's not always the answer people want, but it's the honest one.

Questions About This Process

How do I know if my Bosch washing machine uses E-codes or F-codes?

It depends on the age and model of your machine. Older Bosch washing machines, typically those manufactured before around 2015, commonly display E-codes such as E17 or E18. Newer models in the Series 4, 6, and 8 ranges tend to show F-codes. In practice, the number after the letter is what matters - E18 and F18 describe the same drain fault. If you're not sure which format your machine uses, check the model number on the sticker inside the door seal and run it through the Voltrade GoFIX tool for model-specific guidance.

Can I reset a Bosch error code without fixing the underlying fault?

Yes - unplugging the machine and restarting it will clear the display. But if the root cause is still present, the code will return, usually within the same cycle or the next one. Repeatedly clearing codes without investigating the cause can in some cases make things worse, particularly with drain faults and heating errors where the machine may be working harder than it should to compensate. Always try to understand what triggered the code before resetting and rerunning a programme.

Is it worth repairing an older Bosch washing machine or better to replace it?

A useful rule of thumb is that if the repair costs more than half the price of a comparable new machine, replacement often makes better financial sense - especially on appliances over eight or nine years old. That said, Bosch machines are generally well-built, and many faults (blocked filters, failed door locks, faulty sensors) are relatively cheap to fix. Get a proper diagnosis from a local Addlestone engineer before writing the machine off - some faults that sound expensive turn out to be minor repairs costing well under 100 pounds.