F29
Protherm
Flame Loss During Operation
F29 error, flame is established then lost during operation
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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
Unstable gas supply, Blocked burner, Poor combustion air supply, Faulty ionization electrode or cable
How to Fix / Troubleshooting
Safety first: Turn off power and gas before opening the combustion chamber.
- Check gas supply stability: Confirm that gas pressure remains within specification during operation (technician task).
- Clean burner: Remove and clean the burner for dust, rust, or debris that may cause unstable flame.
- Inspect air intake and flue: Ensure there are no obstructions and that the flue is correctly installed.
- Check ionization electrode: Clean and verify correct position and secure cable connection.
Warning: Flame loss can lead to incomplete combustion; do not ignore repeated F29 faults.
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Repair Difficulty
Hard
4/5
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