Demirdöküm Combi Boiler F29 Error
Flame loss during operation
The flame signal was lost while the boiler was firing; it retried and stopped when it could not recover.
What is error F29?
On Demirdöküm Combi Boiler units, code F29 means flame loss during operation. The flame signal was lost while the boiler was firing; it retried and stopped when it could not recover.
Likely causes
- Drop in gas pressure or temporary gas interruption
- Blocked flue/air duct or wind effect
- Ionisation electrode or board fault
Safe steps you can take
- Check that your other gas appliances are working.
- Make sure the flue outlet outside is not blocked.
- Reset once; if it repeats, call a technician.
Do not work on the flue or gas line yourself.
Video guide
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Watch on YouTubeFrequently asked questions
Is error F29 dangerous?
Gas, water and electricity are involved, so take care. Only do the safe steps on this page and don't touch internal parts.
Is a reset enough?
One reset clears temporary causes. If the code comes back, the real cause remains — don't keep resetting.
How much does the repair cost?
It depends on the part. After diagnosis the service sends the price to your tracking link; nothing is done without your approval.
Is the repair guaranteed?
Services on the platform write the warranty for parts and labour on the service form, which is sent to you as a PDF.
Sources: tesisat.org — Kombi arıza kodları . Code meanings can vary by model; check your user manual.