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Error code reference

Thermador Range Error Code F155

Checksum match error / Cook profile corrupted in EEPROM

Thermador codesThermador range codes
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What the F155 error code actually means

The F155 error means your range has detected that the stored cooking settings or configuration data in its memory have become corrupted or unreadable. The range is refusing to start a cooking mode because it cannot trust the data it needs to operate correctly. This is primarily a control board memory issue and is not a safety hazard, but the range will not cook until the memory is restored or the board is replaced.

Diagnostic procedure

The full F155 procedure

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1
First diagnostic step
Press Cancel key to reset alarm. If displayed again when starting cooking mode, re-write default data to Display Board EEPROM via P7. If not possible, replace Display Board.
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Most common causes of F155

Ranked by how often they cause this code
  1. 1Power surge or sudden power loss
  2. 2EEPROM data degradation over time
  3. 3Failed EEPROM chip on the Display Board
  4. 4Display Board failure
  5. 5Intermittent electrical connection to the Display Board

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Questions people ask about F155

What does F155 mean on a Thermador range?
F155 indicates a checksum match error, meaning the cook profile or configuration data stored in the EEPROM memory on the Display Board has become corrupted or does not match its expected value. The range detects this mismatch during operation and blocks cooking modes from starting. The error points specifically to the Display Board and its onboard EEPROM, not to the oven sensors or heating components.
Is it safe to use my Thermador range while the F155 error is displayed?
The F155 error is a data integrity fault rather than a safety-critical failure such as a temperature runaway or gas leak. However, the range will typically prevent cooking modes from operating when this fault is active. Attempting to bypass or ignore the error is not recommended, as the corrupted data could affect how the control system manages cooking functions.
Can I fix the F155 error on my Thermador range myself?
The initial Cancel key reset is something any user can attempt. However, the next step, re-writing default data to the Display Board EEPROM via the P7 diagnostic procedure, requires access to the service diagnostic mode and familiarity with the control system. If that step is needed, or if the Display Board requires replacement, the repair is best handled by a qualified appliance technician with experience on Thermador equipment.
Will pressing Cancel clear the F155 error on my Thermador range?
Pressing the Cancel key is the first recommended step and may temporarily clear the alarm. However, if the F155 code returns when you attempt to start a cooking mode, the underlying EEPROM data corruption has not been resolved. In that case, a technician will need to re-write the default data to the Display Board EEPROM using the P7 diagnostic procedure, or replace the Display Board entirely.
How much does it cost to fix a Thermador F155 error?
If the error is resolved by re-writing default data to the EEPROM using the P7 procedure, the cost is primarily a service call fee, which typically ranges from $80 to $150 depending on your location. If the Display Board requires replacement, parts and labor combined can range from $250 to $600 or more, depending on the specific model and board availability. Getting a diagnostic quote before authorizing repairs is advisable.

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