F16
Miele
Door Heater / Mullion Heater Fault (on frost-free models)
Freezer shows F16 and ice forms around the door area or in the air ducts
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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
Open-circuit door frame heater, Failed mullion heater element, Faulty heater control relay on PCB, Broken wiring in door or frame
How to Fix / Troubleshooting
Safety first: Unplug the appliance before testing heater circuits.
Steps:
- 1. Inspect for condensation: Look for water droplets or ice around the door frame or between cabinet sections, indicating heater failure.
- 2. Access heater connections: Depending on model, the mullion or door frame heater connections may be behind front trims or in the hinge area.
- 3. Measure heater resistance: Disconnect the heater and measure resistance. An open circuit indicates a failed heater that must be replaced.
- 4. Check wiring: Inspect the harness for breaks, especially where it passes through hinges.
- 5. Control board check: If the heater is good, the control relay or triac on the main PCB may not be energizing it, requiring board replacement.
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Repair Difficulty
Hard
4/5
Required Part
Door Frame Heater
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