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Error code reference

Bosch Range Error Code ER22

Electric cooktop MTwisT control keyboard fault.

Bosch codesBosch range codes

Electric cooktop MTwisT control keyboard fault.

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What ER22 means on a Bosch range

The ER22 error code on a Bosch range indicates a fault within the MTwisT control keyboard system on the electric cooktop. The MTwisT system is Bosch's touch and twist control interface, which combines capacitive touch sensing with a rotary input mechanism to allow precise burner selection and heat level adjustment. When ER22 is triggered, the control board has detected a communication or signal fault originating from this keyboard assembly, meaning the input data from the MTwisT panel is no longer being read correctly or has fallen outside acceptable parameters.

Faults in the MTwisT keyboard can arise from several conditions. Physical damage to the touch surface, moisture intrusion behind the control panel, or debris interfering with the capacitive sensing layer are common culprits. Internal wiring harness issues, such as loose connectors or damaged ribbon cables linking the keyboard to the main control board, can also interrupt the signal path and trigger this code. Over time, thermal cycling inside the cooktop cavity can weaken solder joints or connector contacts on the keyboard module itself.

Because the MTwisT keyboard is a specialized integrated component combining mechanical and electronic elements, faults are not always limited to the touch surface alone. The control board that interprets keyboard input may also contribute to the fault condition if it fails to correctly process signals that the keyboard is sending. Accurate diagnosis requires checking the physical condition of the keyboard, inspecting all associated wiring and connectors, and assessing whether the fault clears after addressing obvious mechanical or connection issues before considering component replacement.

Source: manufacturer service documentation.

Common causes of ER22

  1. 01

    Moisture or debris on the MTwisT keyboard surface

    Wiring / connection

    Liquid spills or food debris on or around the MTwisT touch surface can interfere with the capacitive sensing layer, causing erratic or failed signal readings. Inspect the cooktop surface and the area around the control panel for any visible contamination.

  2. 02

    Loose or damaged wiring harness connector

    Wiring / connection

    The ribbon cable or wiring harness connecting the MTwisT keyboard to the main control board can become loose or develop breaks, interrupting communication between the two components. Check all connectors associated with the keyboard assembly for secure seating and visible damage.

  3. 03

    Failed MTwisT keyboard assembly

    Part replacement

    The keyboard module itself can fail due to internal component degradation, physical damage to the touch layer, or mechanical wear on the rotary element. If cleaning and reseating connections do not resolve the code, the keyboard assembly likely needs replacement.

  4. 04

    Faulty main control board

    Part replacement

    If the main control board cannot correctly interpret signals sent by the MTwisT keyboard, it may generate an ER22 fault even when the keyboard hardware is intact. This is typically ruled out only after the keyboard and wiring have been confirmed to be in good condition.

  5. 05

    Thermal damage to keyboard or connections

    Part replacement

    Repeated heat exposure from the cooktop can degrade solder joints, connector contacts, or internal keyboard components over time. Visible discoloration or warping near the keyboard assembly would indicate heat-related damage.

See the test procedure for each cause

Frequently asked questions about ER22

What does ER22 mean on a Bosch range?
ER22 on a Bosch range indicates a fault with the electric cooktop MTwisT control keyboard. The MTwisT system is the touch-and-twist input panel used to select burners and adjust heat levels. The control board has detected that it cannot properly communicate with or read input from this keyboard assembly. The cooktop will not operate normally until the fault is resolved.
Can I fix the ER22 error on my Bosch range myself?
Some causes of ER22 are approachable for a knowledgeable DIYer, such as cleaning moisture or debris from the control panel surface or reseating a loose wiring connector. However, replacing the MTwisT keyboard assembly or the main control board requires disassembling the cooktop and working with electrical components, which is best handled by a qualified appliance technician. Always disconnect power to the range before inspecting any internal components.
Is it safe to use my Bosch range while ER22 is displayed?
It is not recommended to continue using the electric cooktop while ER22 is active, as the fault means the control keyboard is not functioning reliably. Operating the cooktop with a faulty input system could result in unpredictable behavior, including burners not responding correctly to commands. The oven portion of the range may still function depending on the specific model, but the cooktop should be considered out of service until the fault is resolved.
Will resetting my Bosch range clear the ER22 error?
Cutting power to the range at the circuit breaker for several minutes and then restoring it may temporarily clear the ER22 code if the fault was caused by a transient condition such as a momentary signal disruption. However, if the underlying cause is physical damage, a failed keyboard, or a wiring issue, the error will return once the range is powered back on. A reset alone is not a fix and should be treated as a diagnostic step rather than a solution.
How much does it cost to repair an ER22 error on a Bosch range?
Repair costs for ER22 vary depending on the root cause. If only a wiring connector needs to be reseated, the cost may be limited to a service call fee, typically in the range of $75 to $150. If the MTwisT keyboard assembly requires replacement, parts and labor combined can range from $200 to $500 or more depending on the model and parts availability. Control board replacement tends to be at the higher end of the repair cost spectrum.

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