Error code reference

Bosch Oven Error Code F127

Cancel key redundant return problem; bad connection or bad Display Board or keyboard.

First step from the service manual

Check all connections between keyboard (J1) and Display Board (P5).

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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Step-by-step tests with expected resistance, voltage, and continuity values
Wiring diagram references and connector pinouts from the OEM service manual
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F127 on my Bosch Oven

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Cancel key redundant return problem

From Service Manual 944149, p.41:

1.Check all connections between keyboard (J1) and Display Board (P5).

2.Measure control board supply voltage at the test points. Expected: 12 VDC and 5 VDC; a drop below 4.75 VDC on the logic rail points to a failed onboard regulator.

3.Inspect all connectors on the main control for corrosion, thermal stress, or backed-out pins. Reseat each connector with the power disconnected.

Part 00705047

Control module

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First step from the service manual

Get the full diagnostic procedure for F127.

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