Bosch Washer Error Code E27 — What It Means & How to Fix It

What Does This Error Mean?

The E27 error on your Bosch washer indicates a problem with the mains voltage supply to the machine. The washer monitors the incoming voltage and stops the cycle if it falls outside the safe operating range. This protects the motor and electronics from damage caused by voltage that is too low or unstable.

Affected Models

Bosch 300 Series
Bosch 500 Series
Bosch 800 Series
Most Bosch front-load washers

Common Causes

The wall outlet voltage is too low due to an overloaded circuit or power grid issue
An extension cord is being used — extension cords cause voltage drop under load
The electrical outlet or wiring in your home has a fault
The washer's power cord is damaged, causing a drop in voltage to the machine
A fault inside the washer's power supply board or filter capacitor

How to Fix It

Unplug the washer and wait two minutes. Plug it back in directly into the wall outlet — not through a power strip or extension cord.

Extension cords cannot handle the high current load of a washing machine motor. This alone can cause E27.
Try the washer on a different wall outlet on a different circuit if possible.

If E27 disappears on a different outlet, the original circuit or outlet has a problem.
Check that no other high-power appliances (tumble dryer, air conditioner) are running on the same circuit while the washer is in use.

Multiple heavy appliances on one circuit can cause voltage sag under load.
Inspect the power cord on the washer for any visible damage, kinks, or burn marks near the plug.

A damaged power cord must be replaced — do not tape or repair a damaged appliance power cord.
If the problem persists with a known-good outlet and no extension cord, contact Bosch service. The internal power supply board may be faulty.

Internal power supply repairs require a trained technician with proper test equipment.

When to Call a Professional

If you are plugging directly into a dedicated outlet and still getting E27, call an electrician to test the outlet voltage under load. If the outlet tests fine, the washer's internal power supply board may need replacement. This repair should be done by a qualified appliance technician.

Frequently Asked Questions

Why does E27 only happen during certain parts of the cycle?

The washing machine motor draws the most power during the spin cycle. If your circuit has marginal voltage, it may handle the lower load of filling and washing fine, but fail under the heavy motor load of spinning. This is a sign your circuit is overloaded or has a voltage delivery problem.

Can I use my Bosch washer on an extension cord?

No. Bosch explicitly states the washer must be plugged directly into a wall outlet. Extension cords cause voltage drop and can overheat under the current load of a washer. Using one can damage the machine and may void your warranty.

Is E27 dangerous?

The E27 code itself is a safety feature — the machine is protecting itself from low voltage. However, if the underlying cause is faulty household wiring, that is a safety concern. Have an electrician inspect the circuit if you suspect a wiring problem.