CAL
Fellow
Temperature Calibration Mode / Calibration Error
Display shows “CAL” or calibration prompt and unit behaves erratically with temperature control.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
User accidentally entered calibration mode, Firmware glitch, Corrupted calibration data in control board
How to Fix / Troubleshooting
Safety first: Unplug before extended troubleshooting.
- Exit calibration: Refer to the user manual for your specific Fellow model. Typically, holding the main knob or a combination of buttons for several seconds will exit calibration mode.
- Factory reset: If available, perform a factory reset sequence (often involves holding the control knob while plugging in, then following on-screen prompts).
- Do not change calibration blindly: Incorrect calibration can cause unsafe temperatures. If you accidentally altered calibration values, restore factory defaults.
- If CAL reappears or temperatures are inaccurate: The control PCB may need reprogramming or replacement. Contact Fellow support for model-specific instructions.
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Repair Difficulty
Medium
3/5
Required Part
Control PCB (Firmware / Calibration Data)
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