Error E118

This step-by-step repair guide walks you through fixing error e118 on your Bosch HBL8651UC (Wall Oven). With the right tools and parts, most homeowners can complete this repair in 1–2 hours and avoid a costly service call.

Part of our Top 20 Oven Models & Common Repair Issues Guide. Browse all oven repair guides for related models and issues.

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Common Symptoms & Causes

If your Bosch HBL8651UC is displaying error E118, you may notice one or more of the following symptoms before or alongside the fault code.

The oven display shows the “E118” error code and beeps repeatedly
The oven fails to heat up or reaches temperature then shuts off unexpectedly
The cooling fan runs continuously even after the oven is turned off
The control panel becomes unresponsive or resets itself during operation

Error E118 is typically caused by a faulty oven temperature sensor, a failing control board, or degraded wiring connections that disrupt communication between the sensor and the electronic control unit.

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Safety First

Unplug the oven from the power outlet before starting any repair — never work on a live appliance.
Wear work gloves when handling metal brackets, sheet metal edges, or sharp components.
Take photos with your phone before disconnecting any wiring harnesses or connectors.
Work in a well-lit area with enough floor space to lay removed panels flat.

Tools & Parts Needed

Essential Tools

Phillips #2 screwdriver
¼” nut driver
Multimeter
Work gloves (heat-rated)
Flashlight

Replacement Parts

Step-by-Step Repair Instructions

Step 1

Disconnect power to the oven at the circuit breaker before doing anything else, since E118 indicates a temperature runaway or temperature sensor fault — conditions that can involve a dangerously hot oven or live high-voltage components. Cutting power first protects you from shock and prevents the control board from logging additional fault states while you diagnose.

Step 2

Let the oven cool for at least 30 minutes so residual heat doesn’t skew your resistance reading, then locate the temperature sensor on the back wall of the oven cavity and disconnect its 2-pin harness after removing the 2 Phillips screws. Set your multimeter to resistance and measure across the sensor pins — a healthy sensor reads roughly 1,080Ω at room temperature, and a reading below 800Ω means the sensor is shorted and is sending a false overtemperature signal to the control board, which is what triggers E118; replace the sensor if it fails this test.

Step 3

If the sensor measures within spec, the fault lies in the control board’s temperature comparison circuit, which has lost the ability to correctly interpret the sensor signal — a failed comparison circuit will trigger E118 even when actual oven temperature is normal. Replacing the control board is the correct repair at this point, as this circuit is not field-serviceable.

Step 4

Access the control board by removing the oven’s trim panel, which is held by 2 Phillips screws at the trim edges; take a photo of all harness connections before disconnecting anything so you have a reference for reassembly. Swap in the replacement board, reconnect every harness firmly until each connector clicks, and reinstall the trim panel — a loose harness here will cause new fault codes immediately after power-up.

Step 5

Restore power at the breaker and set the oven to 350°F with an independent oven thermometer placed inside to verify actual cavity temperature. Confirm the thermometer reading stabilizes near 350°F within normal preheat time and that E118 does not return — if the error reappears with a confirmed good sensor and new board, check for a wiring short between the sensor harness and chassis ground before escalating further.

Where to Buy Replacement Parts

Find genuine OEM and aftermarket replacement parts for your Bosch HBL8651UC (Wall Oven) on Amazon:

When to Call a Professional

If the issue persists after completing all steps above, the problem may involve the sealed refrigerant system, a failed main control board, or wiring that requires specialized diagnostic equipment. Contact a licensed appliance technician — attempting sealed-system repairs without EPA 608 certification is illegal and unsafe.

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How Much Does This Repair Cost?

DIY parts for fixing Error E118 typically run $20–$80, depending on whether you need a temperature sensor, control board component, or wiring harness. A professional service call on a Bosch HBL8651UC generally costs $150–$300, including labor. Tackling this repair yourself can save you $100 or more.

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Frequently Asked Questions

What does error E118 mean on my Bosch HBL8651UC wall oven?

Error E118 indicates a fault with the oven’s temperature sensor or its connecting wiring. The oven cannot accurately read the internal temperature, so it shuts down as a safety precaution.

Can I clear error E118 by simply resetting the oven?

A reset by cutting power at the breaker for 60 seconds may temporarily clear the code, but it will return if the faulty sensor is not replaced.

Is it safe to use my Bosch wall oven while error E118 is displayed?

No, you should avoid using the oven until the repair is complete. An inaccurate temperature reading can result in undercooked food or uncontrolled overheating.

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