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The F155 error means CORRUPTED EEPROM
1. If the fault message is displayed at power-up, ignore it. Sometimes at power down, the control saves the current time but fails to calculate and write the checksum in its memory. At the following power-up, a fault occurs due to this failure.
2. If F155 appears when starting a cooking mode, it means that the cooking parameters in the control memory are corrupted. The display board will have to be replaced.
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beacause the cooking parameters in the control memory are corrupted and it is not regulating the proper temps, the information I provided came directly from the manufacturers service manual so it is correct information. I will be glad to upload the manual if you wish to look for yourself, thanks.
sir I will opt out because I have told you what the issue is but you will not accept it. Maybe another tech can help you, thanks.
Sir I am a different tech would you still like some help?