Bosch · Washing Machine

E3

Drum Not Reaching Temperature

Severity

Medium

If your Bosch Washing Machine is displaying the error code E3, the control board has detected a fault identified as "Drum Not Reaching Temperature". Understanding the root cause helps you avoid an unnecessary service call.

Owner's Summary

Your Bosch washer is not heating the wash water to the correct temperature. You can still use cold wash programs, but hot and sanitize cycles will not work until the heating system is repaired.

Symptoms

Bosch washer hot cycle not heating water, E3 error code

Common Causes

Failed NTC temperature sensor
Burned out heating element
Defective PCB heater relay
Scale buildup insulating the heater

How to Fix

1 Test NTC thermistor resistance at 77°F — should read approximately 10k ohms
2 Test heater element continuity — replace if open circuit
3 Descale the element with citric acid if heavily scaled
4 Replace PCB if heater and sensor both test within spec

Tools You'll Need

Multimeter Vinegar or Descaler

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

Technical Explanation

The Bosch control module monitors water temperature via NTC thermistor feedback throughout the wash phase. E3 is triggered when the expected temperature rise does not occur within a defined time window — indicating heater failure, sensor failure, or relay fault.

Is It Safe to Keep Using?

No immediate safety concern. Use cold wash cycles. Fix within a couple of weeks.

Technician's Pro Tip

In hard water areas, Bosch heating elements scale up rapidly. If the element has continuity but the machine posts E3, descale first with citric acid before replacing the element — a scaled element can have good continuity but poor heat transfer.

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 E3 mean on a Bosch Washing Machine?

Code E3 on a Bosch Washing Machine indicates "Drum Not Reaching Temperature." In practice, the most common trigger is failed NTC temperature sensor. Severity is rated medium, and typical repair costs range from $15 to $280.

Can I fix E3 myself, or do I need a technician?

Many cases of E3 can be resolved without a technician. The first step to try: test NTC thermistor resistance at 77°F — should read approximately 10k ohms. 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 E3 showing?

No immediate safety concern. Use cold wash cycles. Fix within a couple of weeks.

How much does it cost to repair E3 on a Bosch Washing Machine?

Repair costs for code E3 typically range from $15 to $280. NTC sensor: $15–$40; Heating element: $40–$160; PCB: $100–$280. 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

$15 – $280

NTC sensor: $15–$40; Heating element: $40–$160; PCB: $100–$280