Bosch Washing Machine Error Codes Explained by Newcastle upon Tyne Appliance Engineers

Published August 2026 | Bosch Washing Machine Error Codes

In the First 10 Minutes

The moment a Bosch washing machine flashes an error code, your instinct is probably to hit start again and hope it clears. Resist that. Some fault codes indicate conditions that can damage the machine further if you keep running it, and a handful signal situations where water or electrical safety is a genuine concern.

Here is what to do in the first ten minutes:

1. Note the exact code displayed. Bosch uses both letter-and-number codes (F17, E18) and sometimes flashing light sequences on older models without digital displays.
2. Turn the machine off using the power button, then switch it off at the wall socket.
3. If there is water on the floor around the machine, lay down old towels and check whether the door seal or a hose connection at the back is leaking.
4. Do not try to force the door open if the code is door-related - the drum may still hold water.
5. Open the door filter cover at the bottom front of the machine. Have a shallow tray and a cloth ready before you unscrew the filter cap, as trapped water will spill out.

The codes you are most likely to see on Bosch machines in everyday households across Newcastle upon Tyne fall into four main groups: door and lock faults, water intake and drain faults, temperature and heating faults, and motor or control board faults. Knowing which group your code sits in tells you a lot about the likely fix before any engineer arrives.

Within the First Hour

What the most common Bosch error codes actually mean

Our engineers see a fairly consistent pattern of codes across call-outs in Tyne and Wear. Here is a practical breakdown of the ones that come up most regularly.

F17 / E17 - Water intake fault. The machine is not filling with water, or not filling quickly enough. Check the inlet hose at the back is not kinked, and check that the stopcock (the tap behind or beside the machine) is fully open. On older Bosch Series 4 and Series 6 models, a blocked inlet filter mesh is the most common cause. Turn off the water, disconnect the inlet hose, and rinse the small mesh filter under a tap.

F18 / E18 - Drain fault. Water is not pumping out. This is nearly always a blocked pump filter or a kinked drain hose. Clean the filter as described above. If the hose loops correctly and the filter is clear, the pump itself may have failed. A replacement pump on a Bosch machine typically costs between 120 and 200 pounds fitted.

F19 / E19 - Heating issue. The water is not reaching the correct temperature within the expected time. This often points to a failing heating element, which is one of the more common faults on Bosch machines over five years old. Elements can be tested with a multimeter and replaced, though access varies by model.

F21 / E21 - Motor fault. Less common, but when it appears it usually means the motor brushes are worn (on brush motors) or the inverter board has developed a fault (on brushless motors). Repair costs vary considerably - brush replacement is relatively cheap at 80 to 130 pounds fitted, while a control board can run to 200 to 350 pounds depending on the model.

F43 / E43 - Control unit fault. This one typically means the main PCB (printed circuit board) has detected an internal error. A hard reset sometimes clears it: switch off at the wall, wait two minutes, switch back on. If it returns, you likely need an engineer.

F02 / E02 - Door lock fault. Either the door is not closing properly, or the latch mechanism or lock actuator is faulty. Check nothing is caught in the door seal and push the door firmly. If the code persists, the door interlock will need replacing - typically 80 to 150 pounds fitted.

Codes that need immediate professional attention

Most error codes are inconvenient rather than dangerous, but a few warrant a call to an engineer without attempting home fixes. F23 (water detected in the base of the machine) means the anti-flood device has triggered. This happens when a component has leaked internally. Switch off, do not tilt the machine, and call for help. Similarly, any code accompanied by burning smell, visible sparking, or trip of your home's fuse board means you should not touch the appliance until it has been inspected.

Same Day

Once you have identified the code and done the basic checks, you can make a clear-headed decision about whether this is a DIY fix or whether you need to book an engineer.

For Newcastle upon Tyne households, booking same-day or next-day appliance repair is usually possible through a local trade platform. When you book through Voltrade, you can run the Voltrade GoFIX diagnostic tool with your fault code before the engineer arrives - it helps narrow down the likely cause and means the engineer often comes prepared with the right part, which cuts down on return visits.

When you call or book, have the following ready:

1. The exact error code from the display
2. The model number - usually on a sticker inside the door frame
3. The serial number from the same sticker
4. How old the machine is and whether it is still under warranty (Bosch typically offers a standard two-year warranty, with some retailers offering extended cover)
5. A description of what the machine was doing when the fault appeared - was it mid-cycle, on spin, at the start of a wash?

On the question of repair versus replace: Bosch machines are generally worth repairing if they are under eight years old and the repair cost is less than half the replacement cost. A mid-range Bosch Series 4 or Series 6 machine retails at 450 to 700 pounds new. If the repair quote comes in at 200 pounds or below, repair typically makes more sense.

The Repair Visit

Most appliance repair call-outs in Tyne and Wear take between 45 minutes and two hours, depending on the fault and the model. Door lock swaps and filter pump replacements are usually completed in under an hour. Motor work and PCB replacements take longer, particularly if the engineer needs to partially strip the machine to access components.

What to expect on the day:

The engineer will confirm the fault code and run their own diagnostic check, which may reveal secondary faults not shown on the display. They will quote for parts and labour before starting work - a reputable engineer will not proceed without your agreement on cost.

Call-out charges across Newcastle upon Tyne typically run between 60 and 90 pounds, which is usually absorbed into the final repair cost if you go ahead. Parts are charged on top. As a rough guide:

• Door interlock replacement: 80 to 150 pounds all in
• Pump replacement: 120 to 200 pounds all in
• Heating element replacement: 130 to 210 pounds all in
• Motor brushes: 80 to 130 pounds all in
• Main PCB replacement: 200 to 350 pounds all in

These figures are for 2026 and reflect typical rates across the North East. Prices vary by engineer and by Bosch model - older or less common machines may need sourced parts, which can add to cost and lead time.

The Following Week

After the repair, run a short test cycle - a 40-degree cotton wash works well - and stay with the machine for the first 20 minutes to make sure it fills, heats, and drains without issue. Check under and around the machine for any signs of water after the cycle completes.

If the same error code reappears within a week, contact the engineer. Reputable traders offering work through platforms like Voltrade include a parts and labour guarantee on the repair - typically 30 to 90 days depending on the job.

A few things worth checking in the week after repair:

1. Clean the door seal by wiping around the rubber gasket with a damp cloth. Residue and mould in the seal is the number one cause of persistent door-related faults on Bosch machines.
2. Run a drum clean cycle (some Bosch models have a dedicated drum clean programme, otherwise use a 90-degree empty wash).
3. Check your detergent drawer and rinse it under a tap - blocked dispensers contribute to both F17 intake faults and mould growth.

Long Term

Most Bosch washing machine faults that our engineers see in Newcastle upon Tyne households are preventable with basic maintenance. Bosch builds reliable machines - many Series 4 and Series 6 models run for 10 to 15 years with no major faults - but they are not maintenance-free.

To avoid repeat error codes:

1. Clean the filter every three months. It takes five minutes. A clogged filter is responsible for a significant proportion of F18 drain faults and places strain on the pump.
2. Use the correct detergent dose. Excess detergent creates foam that triggers anti-foam sensors and can mimic fault codes. Use the dose marked on the detergent packaging for your water hardness - Newcastle upon Tyne and the wider Tyne and Wear area is in a soft-to-medium water zone, so you typically need less than the maximum dose.
3. Do not overload the drum. A consistent pattern of overloading accelerates bearing wear and strains the motor, leading to F21 and related codes over time.
4. Leave the door slightly open between washes. This allows the drum and seal to dry out and dramatically reduces mould growth.
5. Run a hot wash monthly. A 60-degree or 90-degree wash on an empty or near-empty drum clears bacterial build-up and helps flush the system.
6. Check hoses annually. Rubber deteriorates over time. Look for cracks or bulging in the inlet and drain hoses, particularly where they connect to the machine and to the wall.

If your machine is over eight years old and you are seeing recurring faults, it may be worth having an engineer give it a broader health check rather than just repairing the presenting fault. Many issues travel together on older machines - a worn pump and a degrading heating element, for instance, often appear within months of each other.

Timeline Questions

How long does it take to repair a Bosch washing machine with a fault code?

Most common faults - door locks, drain pumps, heating elements - are completed in a single visit lasting 45 minutes to two hours. If a part needs ordering, you are typically looking at one to three days before the engineer can return. Control board faults occasionally require parts sourced directly from Bosch, which can extend that timeline by a few days, particularly for older models.

Is it worth repairing a Bosch washing machine or should I replace it?

As a general rule, if the machine is under eight years old and the repair costs less than half the price of a comparable new model, repair makes sense. Bosch machines have a strong reputation for longevity, and a well-maintained Series 4 or Series 6 can comfortably run for 12 years or more. If you are seeing multiple fault codes on an older machine, get a full assessment before committing to an expensive component repair.

Can I clear a Bosch error code myself without calling an engineer?

Some codes can be resolved without professional help. F17 inlet faults often come down to a kinked hose or closed stopcock. F18 drain faults frequently clear after a filter clean. A hard reset - switching off at the wall for two minutes - clears some temporary control unit errors. However, codes related to heating, the motor, or internal flooding are best assessed by a qualified engineer. Attempting to bypass safety interlocks or work on electrical components without the right training carries real risk.

What do Bosch error codes starting with F mean compared to E codes?

On most Bosch washing machines, F codes and E codes refer to the same underlying fault. The prefix used depends on the model and the age of the machine. Older Bosch models commonly use the E prefix (E17, E18, E19), while newer models and those with more advanced displays tend to use F codes. If you see either prefix followed by the same number, treat them as equivalent. Some engineers use the terms interchangeably, which can cause confusion, but the fault and the fix are the same.