Bosch E27 Washing Machine Error Code — What It Means & How To Fix It

Diagnosis

What this error means

The E27 error code on your Bosch washing machine means a power supply fault has been detected — the machine is not receiving a stable or correct voltage from the mains supply.

The E27 error indicates that the main control board has detected an issue with the incoming power supply. This could be caused by a voltage that is too low or too high, an unstable mains supply with frequent fluctuations, a faulty plug or socket, a damaged mains cable on the machine itself, a problem with the machine's internal power filter board (anti-interference capacitor board), or in rarer cases a fault on the main PCB (control board). E27 can also appear following a power cut if the voltage is unstable when power is restored. In the UK, mains voltage should be 230V at 50Hz — significant deviation from this can trigger E27. This error should always be treated carefully as it involves the machine's main electrical supply.

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For information purposes only. Always consult a qualified engineer before attempting repairs. 🔌 Unplug your appliance before any inspection or repair.

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What to try first

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Fix time

5–15 minutes

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Difficulty

Competent DIY

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Appliance

Washing Machine

Step-by-step

Switch off the machine and unplug it completely

Do not attempt any checks while the machine is connected to power.

Wait 5–10 minutes before plugging back in

Voltage fluctuations often resolve within a few minutes. If there has been a power cut or storm, wait until the supply has fully stabilised.

Plug a different appliance into the same socket

Test whether the socket is working correctly with a lamp, kettle, or phone charger. If other appliances also behave unusually, the issue is with the socket or household wiring rather than the machine.

Avoid using extension leads or multi-socket adaptors

Washing machines should always be plugged directly into a dedicated wall socket. Extension leads can cause voltage drop and supply instability.

Check the machine's mains lead and plug

Inspect the plug, cable, and the point where the cable enters the machine for any visible damage such as cuts, burns, scorch marks, or a loose connection. Do not use the machine if any damage is found — this is a safety risk.

Contact an electrician if the socket appears faulty

Scorch marks, loose sockets, or a socket that trips the fuse box when used should be investigated by a qualified electrician before the machine is used again.

Diagnostic

Symptoms to look for

E27 displayed on the control panel
Machine stops suddenly with no other obvious cause
Machine fails to start from cold
Display flickering or behaving erratically
Machine trips the household fuse box when switched on

Step-by-step repair guide

Diagnostic steps

Time 15–30 minutes

Skill Competent DIY

Treat the fault as electrical — prioritise safety

E27 is a power supply fault. Any time there is a potential electrical fault on a mains-connected appliance, safety must come first. Unplug the machine before doing anything else. If you noticed any sparking, burning smells, or the machine felt warm or hot to the touch on the casing, do not plug it back in and contact a qualified engineer.

Never investigate an electrical fault while the machine is connected to the mains supply. Mains voltage (230V) is lethal.

Wait for the supply to stabilise

If E27 appeared during or after a storm, power cut, or at a time when other appliances were also behaving unusually, the issue may be a temporary mains supply problem. Leave the machine unplugged for 10 minutes, then plug back in and retry.

UK mains voltage can fluctuate briefly during high-demand periods or after power restoration following an outage. Bosch control boards are sensitive to significant voltage variations and may display E27 as a precaution.

Test the socket

Plug a different high-wattage appliance (such as a kettle or vacuum cleaner) into the same socket and run it for a minute or two. If this appliance also behaves erratically, trips the fuse box, or you notice the socket feeling warm, there is a wiring or socket fault that needs investigation by a qualified electrician.

A warm or discoloured socket is a potential fire hazard. Stop using it immediately and contact a qualified electrician — not an appliance engineer.

Inspect the machine's mains cable and plug

Examine the full length of the power cable from the plug to where it enters the machine. Look for cuts, abrasions, burn marks, or damage where the cable flexes near the plug or machine entry point. Check the plug pins for discolouration or burning. If any damage is found, do not use the machine. A damaged mains cable on a washing machine should be replaced by a qualified engineer.

Do not attempt to repair a damaged mains cable yourself using tape or connectors. A damaged washing machine mains lead must be professionally replaced.

Plug directly into a wall socket

Ensure the machine is plugged directly into a dedicated mains socket and not via an extension lead, multi-socket adaptor, or surge protector strip. These can cause voltage drop under the high-current load of a washing machine (which can draw 10–13 amps during a heating cycle) and may trigger E27.

Washing machines are high-current appliances. They should always be connected to a dedicated, properly earthed wall socket — ideally on their own circuit.

Consider the internal power filter board

If the mains supply checks out as normal and the error persists, the fault may lie with the machine's internal interference filter board (also called a noise filter or anti-surge board). This is the first internal component in the power path and can develop faults over time. Replacement requires opening the machine and working near mains voltage — this must be done by a qualified engineer.

Internal electrical components should only be accessed and replaced by a qualified appliance engineer. Do not attempt this yourself unless you are professionally trained.

Escalation

When to call an engineer

E27 persists after power reset and with a confirmed good socket
Machine trips the fuse box when plugged in or started
Any burning smell, sparks, or abnormal heat from the machine or plug
Mains cable found to be damaged or burnt
Internal power filter board fault confirmed on testing
Main PCB suspected of power circuit fault

Common questions

Frequently asked questions

What does E27 mean on a Bosch washing machine?

E27 means the machine has detected a fault with its incoming power supply. This could be a voltage problem from the mains, a faulty socket or plug, a damaged mains cable, or an internal power filter board fault.

Can a power cut cause E27 on a Bosch washing machine?

Yes. A sudden power cut and restoration can cause a brief voltage spike or drop that triggers E27. In many cases, unplugging the machine for 10 minutes and restarting after the supply has stabilised will clear the error.

Is E27 on a Bosch washing machine dangerous?

It can be. Any error code involving the mains power supply should be taken seriously. If you noticed sparks, burning smells, or abnormal heat during the fault, do not use the machine and call an engineer. If the fault was caused by a socket or wiring issue, contact a qualified electrician.

Can I fix E27 on a Bosch washing machine myself?

You can safely check the socket (by testing with another appliance), ensure the machine is plugged directly into a wall socket, inspect the mains cable for visible damage, and wait for a power supply issue to resolve. Internal electrical component replacement must be done by a qualified engineer.

Should I use a surge protector with my Bosch washing machine?

A surge protector can help protect the machine from voltage spikes, but the machine must still be connected via a properly rated socket capable of handling the machine's full current draw. Some surge protectors are not rated for high-current appliances — check the rating before use.

🎯 What is most likely causing your Bosch E27 error?

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Temporary mains voltage fluctuation or power cut 35%

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Faulty wall socket or extension lead causing voltage drop 25%

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Damaged or degraded machine mains cable or plug 20%

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Faulty internal power filter (noise filter) board 15%

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Main control board power circuit fault 5%

⚠️ Estimates based on common faults — not a guaranteed diagnosis. Always verify before ordering parts.

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Parts you may need

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🇬🇧 UK — Parts & Replacements