Bosch · Washing Machine

E27

Mains Voltage Too Low

Severity

Medium

Your Bosch Washing Machine stopped working and is showing error E27, which corresponds to a fault called "Mains Voltage Too Low". This is one of the most searched error codes for this appliance — you are not alone, and there is a clear fix.

Owner's Summary

Your Bosch washer detected that the electrical voltage coming from the wall outlet dropped below safe operating levels. This is usually a home electrical issue, not an appliance fault. Check if other appliances on the same circuit are causing the voltage to sag.

Symptoms

Bosch washer stopping mid-cycle, display flickering, E27 error

Common Causes

Household voltage below 100V AC (specification minimum)
Overloaded electrical circuit
Loose power cord connection
Failing power supply in the machine

How to Fix

1 Check the circuit is not sharing other high-draw appliances
2 Inspect power cord and outlet connection
3 Measure outlet voltage with a multimeter
4 Have an electrician check the circuit
5 If voltage is stable, replace internal power supply board

Tools You'll Need

Multimeter Flashlight

These are simple, low-risk fixes most homeowners can do with tools already in a basic toolbox.

Technical Explanation

The Bosch power supply module continuously monitors AC input voltage through a voltage divider and ADC circuit. When input voltage drops below the 100V lower threshold for more than 200ms, the control module posts E27 and enters a protective shutdown to prevent damage to motor drive components.

Is It Safe to Keep Using?

Running appliances on low voltage causes overheating in motors and transformers. Resolve the voltage issue before continued use.

Technician's Pro Tip

Bosch washers are sensitive to voltage drops. If E27 appears consistently during the spin cycle — when motor demand is highest — the circuit is almost certainly overloaded. Dedicate a 20A circuit to the washer.

Related Codes

E2 — Samsung Washing Machine

Water Supply Error

High

4E — Samsung Washing Machine

No Water Supply Detected

High

5E — Samsung Washing Machine

Drain Error — Water Not Draining

High

Frequently Asked Questions

What does error code E27 mean on a Bosch Washing Machine?

Code E27 on a Bosch Washing Machine indicates "Mains Voltage Too Low." In practice, the most common trigger is household voltage below 100V AC (specification minimum). Severity is rated medium, and typical repair costs range from $0 to $250.

Can I fix E27 myself, or do I need a technician?

Many cases of E27 can be resolved without a technician. The first step to try: check the circuit is not sharing other high-draw appliances. If that doesn't clear the code, work through the remaining steps in the "How to Fix" section above before assuming a part needs replacing.

Is it safe to keep using my washing machine with code E27 showing?

Running appliances on low voltage causes overheating in motors and transformers. Resolve the voltage issue before continued use.

How much does it cost to repair E27 on a Bosch Washing Machine?

Repair costs for code E27 typically range from $0 to $250. Outlet check: $0; Electrician: $75–$150; Power supply board: $80–$250. Costs on the low end usually reflect a DIY fix with no parts required, while the high end reflects a part replacement plus professional labor.

Estimated Repair Cost USD

$0 – $250

Outlet check: $0; Electrician: $75–$150; Power supply board: $80–$250