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ErrBase

Bosch Oven E305 Error Code: Oven Sensor Fault

Quick Answer

Bosch E305 is a temperature sensor fault specific to Bosch wall ovens and ranges. Bosch uses NTC thermistors rather than RTD probes (which Whirlpool and GE use), so the resistance specification is different. A Bosch oven NTC reads approximately 20K ohms at room temperature (compared to 1,080 ohms for Whirlpool RTD).

Bosch E305 is a temperature sensor fault specific to Bosch wall ovens and ranges. Bosch uses NTC thermistors rather than RTD probes (which Whirlpool and GE use), so the resistance specification is different. A Bosch oven NTC reads approximately 20K ohms at room temperature (compared to 1,080 ohms for Whirlpool RTD). This is the most common ordering mistake - using a Whirlpool sensor in a Bosch oven gives completely wrong readings. Bosch sensors are typically mounted on the rear wall of the cavity with a 2-wire connector. Measure resistance at the connector: ~20K ohms at 77F, decreasing as temperature rises.

BoschOvenSeverity: mediumDifficulty: intermediate75% DIY Success
Time to Fix
20–90 min
Difficulty
intermediate
Parts Cost
$20 – $120
Tools Needed
Multimeter, Nut driver set

What Does the E305 Code Mean?

Bosch oven E305: E305 on a Bosch oven indicates the oven temperature sensor (NTC thermistor) has failed or is reading outside its expected range.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

NTC thermistor open circuit (burned out)55%
Sensor connector corroded20%
Sensor wiring pinched or shorted12%
Control board sensor input failed8%
Grease buildup at probe tip5%

Symptoms You May Notice

  • E305 on display
  • Oven error during self-clean
  • Sensor reading incorrect

Can you reset a Bosch oven to clear the E305 code?

Turn circuit breaker off for 60 seconds. Turn on. If code returns immediately, the fault is persistent. Some codes clear after the oven cools down from self-clean.

Tools Required for Diagnosis

MultimeterNut driver setFlashlight

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

1

Turn breaker off 5 minutes

Turn breaker off 5 minutes. If code clears, monitor.

2

Test NTC sensor

3

Replace the faulty component with the Bosch-specific part

Replacement Parts

If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.

Part Name
Bosch Oven NTC Temperature SensorModel-specific · $20–$45
Bosch Oven Door Lock AssemblyModel-specific · $50–$120

Repair vs. Replace Calculator

Appliance Age (Years)7 Yrs
Labor Approach
Our Verdict
REPAIR
Estimated Cost: $70 (Parts) vs $4000 (New Machine)

Frequently Asked Questions

Is Bosch E305 the same as Whirlpool codes?
No. Bosch uses a completely different error code system and different components. Bosch uses NTC thermistors while Whirlpool uses RTD probes. Parts are NOT interchangeable. Always use Bosch-specific parts.
Bosch oven repair cost?
Bosch parts are typically 20-50% more expensive than Whirlpool equivalents. Sensor: $20-45. Lock assembly: $50-120. Board: $150-350. Labor rates are similar ($100-200). Total repair: $200-500.
Where can I find Bosch oven parts?
Bosch parts are available through BSH Home Appliances (Bosch's parent company), boschparts.com, and major parts retailers. Provide your full model number (starts with HBL, HBN, HGI, etc.) for exact part match.

Same Fix Works on These Brands

Bosch shares the same hardware platform with these brands. The diagnosis and repair steps are identical.

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Models Known to Experience E305 Errors

This repair applies to most Bosch ovens with this error code. Common model numbers include:

HBL8451UC, HBN8451UC, HGI8056UC, HBL5351UC

Last verified for technical accuracy on March 15, 2026