Vaillant
Codes F.22, F.28, F.29, F.75…: meaning and what the technician checks. See the Vaillant codes →
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Boiler Error Code: All Brands
Has your boiler stopped and is it showing a code? Choose its brand below to find out what the code means. A code tells you where the problem is; the technician's diagnosis finds the cause and fixes it. Our heating engineers work 7 days a week on all boiler brands, gas and oil.
5,0on Google· 22 years of experience
15 brandsGas and oil
7 days a weekEvenings and weekends
DiagnosisOn site, by a technician
22 years of experiencePrice given upfront
What does an error code on a boiler mean?
A modern boiler constantly monitors ignition, the flame, water pressure, temperatures, the fan and the flue. As soon as a value goes out of range, it stops to protect itself and shows a code: a letter, a number or both, sometimes a blinking light.
Each manufacturer has its own codes. F.28 on a Vaillant, 6A on a Buderus and EA on a Bosch all mean "no flame", but not for the same reasons nor on the same parts. That is why every brand has its own page with its full table.
Why call a technician
The same code can have several causes: an ignition fault can come from the gas supply, a worn electrode, the gas valve or the circuit board. Only measurements on site show which one, and avoid replacing a part for nothing.
Our heating engineer reads the boiler's fault memory, measures, finds the cause and gives you the price of the repair before doing it. He leaves you the job report and a boiler that starts again without going back into safety mode.
Choose the brand of your boiler
Buderus
Codes 6A, 4C, 3C, EL…: meaning and what the technician checks. See the Buderus codes →
Bosch
Codes EA, E9, A1, C6…: meaning and what the technician checks. See the Bosch codes →
Viessmann
Codes F2, EE, EF, A8…: meaning and what the technician checks. See the Viessmann codes →
Bulex
Codes F.22, F.28, F.75…: meaning and what the technician checks. See the Bulex codes →
Junkers
Codes EA, E9, CE…: meaning and what the technician checks. See the Junkers codes →
Remeha
Codes E04.10, H02.02, H01.08…: meaning and what the technician checks. See the Remeha codes →
De Dietrich
Codes E04.10, H01.05, H02.02…: meaning and what the technician checks. See the De Dietrich codes →
Wolf
Codes 01, 04, 05, 12…: meaning and what the technician checks. See the Wolf codes →
Ariston
Codes 501, 108, 104…: meaning and what the technician checks. See the Ariston codes →
Chaffoteaux
Codes 501, 108, 601…: meaning and what the technician checks. See the Chaffoteaux codes →
Ferroli
Codes A01, A03, F37…: meaning and what the technician checks. See the Ferroli codes →
ACV
Codes and warning lights: meaning and what the technician checks. See the ACV codes →
Atag
Codes and warning lights: meaning and what the technician checks. See the Atag codes →
Riello
Codes and warning lights: meaning and what the technician checks. See the Riello codes →
The codes we see most often
A few very common codes, all brands together. For the details, open the page of your brand.
| Brand | Code | Meaning | What the technician checks |
|---|---|---|---|
| Vaillant | F.28 | No ignition at start-up | Gas supply, electrode, gas valve, board |
| Vaillant | F.75 | No pressure rise detected when the pump starts | Pump, pressure sensor, circuit pressure |
| Buderus | 6A | No flame after several ignition attempts | Gas, ignition and ionisation electrodes |
| Buderus | 4C | Temperature limiter tripped | Circulation, pump, fouled heat exchanger |
| Bosch / Junkers | EA | No flame detected | Gas, ionisation electrode, connections |
| Bulex | F.28 | Ignition failure | Gas, ignition, gas valve |
| Viessmann | EE | No flame signal at burner start | Electrodes, gas supply |
| Remeha | E04.10 | Burner failed to start after five attempts | Gas supply, ignition electrode, gas valve |
| Ariston | 501 | No flame detected | Gas supply, electrode, gas valve |
Code not in this table: call us, our technician knows it.
Smell of gas? Do not touch any switch, open the windows, leave the house and call 112 from outside. For any other code, write it down and call us.
How the repair works
You give us the code
By phone or WhatsApp: brand, model and the code on the display. A photo of the screen helps us prepare the right parts.
The price is announced
We give you the price of the call-out and the first hour before coming.
The technician repairs
Diagnosis, repair, combustion test, then job report and invoice handed over.
What our customers say
Where do we work?
Our heating engineers repair all boiler brands throughout Belgium: in Brussels, in Wallonia and in Flanders. Call us and we will tell you straight away when someone can be at your home.
BrusselsWalloon BrabantFlemish BrabantHainautNamurLiègeLuxembourg provinceAntwerpEast FlandersWest FlandersLimburg
The brands we work with
Our technicians work on all brands: they install, service and repair appliances from the major manufacturers. For a new installation, we recommend the model that suits your home and budget.
We buy our equipment from all the major Belgian wholesalers and suppliers, including Facq, Van Marcke and Desco: genuine parts, quickly available.
Frequently asked questions
What should I do when my boiler shows an error code?
Note the code and the brand, then call us. The technician knows what to look at for that code and comes with the most likely parts.
Can I restart the boiler several times?
No. A boiler that keeps going into safety mode has a real fault: restarting it over and over does not fix it and can damage some parts.
Does an error code always mean a breakdown?
No. Some codes are simple operating messages (heating mode, hot water, standby). The table of each brand shows which ones.
Which brands do you repair?
All the common brands in Belgium: Vaillant, Bulex, Viessmann, Buderus, Bosch, Junkers, Remeha, De Dietrich, Saunier Duval, Wolf, Ariston, Chaffoteaux, Ferroli, Riello, ACV, Atag and others.
How quickly can you come?
For a breakdown we offer the first available slot, often the same day depending on your area. The price is given before the work.
Do you hand over a document after a service?
Yes. After servicing a boiler, the technician gives you the service attestation.
Is the quote for a new boiler free?
Yes. If a repair is no longer worth it, we come to see your installation and give you a free quote for a new boiler or a heat pump.
Is your boiler showing a code?
Call us or choose a slot online: a heating engineer comes to your home with the right parts.