F28 or F29
No flame at start, or flame lost while running: gas supply, electrode, flue or condensate drain.
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Vaillant Heating Engineer: Boiler Repair, Servicing and Breakdowns
A Vaillant boiler that locks out, flashes an F code or simply needs its periodic service: that is our daily work. Our engineers cover the whole country, from Brussels to Wallonia and Flanders, 7 days a week, and you always know the price before anything is done.
5,0on Google22 years of experiencePrice agreed before the work
ecoTEC specialistsPlus older turboTEC units
Gas and heat pumpsaroTHERM too
Maintenance attestationGiven at the end of the visit
7 days a week5.0 on Google
When a Vaillant boiler breaks down
Across Belgium, the Vaillant you have at home is most likely a wall-hung condensing model of the ecoTEC line (ecoTEC plus, ecoTEC pro, ecoTEC exclusive), or an older turboTEC or atmoTEC in a flat that has not been renovated yet. Each one reports its problems with an F code on the display.
F28 means the boiler tried to light and failed; F22 points to a lack of water in the circuit. Write the code down and give it to us on the phone, together with the model shown on the label. With that information, the engineer often arrives with the right part in his van.
He then measures instead of guessing: gas pressure, flame signal, fan speed, pump, diverter valve, sensors. You hear the cause and the repair price before any part is changed. The meaning of every common code is on our Vaillant error codes page.
Periodic Vaillant service with attestation
Belgian law requires gas and oil boilers to be serviced, and the rhythm is not the same in each Region nor for each fuel. When you book, we tell you the interval that applies to your address and can remind you before the next one.
The visit itself is thorough. The engineer cleans the heat exchanger and burner, clears the condensate siphon (on condensing boilers, a blocked siphon is one of the top reasons for a lockout), checks the expansion vessel and safety devices, then measures CO and CO2 and corrects the settings if the figures drift.
Before leaving, he reads the fault memory, which shows what the boiler went through since the last visit, and hands you the maintenance attestation that insurers, landlords and notaries may ask for.
A new Vaillant boiler or an aroTHERM heat pump
Some boilers are no longer worth fixing: twenty years of service, parts that are being discontinued, a heat exchanger that leaks. We say so frankly, and we explain what would replace it best: a new condensing boiler sized for your home, an air-to-water heat pump such as the Vaillant aroTHERM plus, or both together in a hybrid setup.
A home visit comes first. We look at the radiators or floor heating, the insulation, how much hot water the household uses, the flue and the space outside. You then receive a free, detailed quote with the options compared.
Our own team carries out the work, commissions the appliance and shows you the controls, such as a sensoCOMFORT thermostat. We stay your contact for servicing and repairs afterwards.
Radiators and circuit around your Vaillant
A boiler in perfect order can still leave a room cold. Air trapped in radiators, valves stuck after the summer, sludge in old steel pipes or a pressure that slowly drops are circuit problems, and they make any boiler work harder.
We bleed and balance the radiators, free or replace thermostatic valves, flush the circuit when sludge is present and find the cause of a falling pressure: a small leak, the expansion vessel or the relief valve.
If a radiator is undersized or leaking, we replace it. Every job is priced before we start.
Vaillant faults we meet every week
A quick overview, so you know what to tell us when you call. Please do not open the boiler yourself.
Pressure under 1 bar
The boiler protects itself. A leak, the expansion vessel or the relief valve is to blame.
Cold water at the taps
Diverter valve or a scaled plate exchanger on a combi, very common with hard water.
Noisy operation
Scale in the exchanger or a pump at the end of its life.
Blank display
Fuse, power supply or main board: measured before anything is ordered.
Your Vaillant appointment in three steps
Contact us
Phone, WhatsApp or the online form. A photo of the screen and the label helps a lot.
Price first
The call-out charge and first hour are stated before we travel; parts are quoted on site.
Repair or service
The engineer explains what he did and leaves the job sheet, the invoice and, after a service, the attestation.
What our customers say
Vaillant repairs throughout Belgium
We repair and service Vaillant boilers all over Belgium: in Brussels, where we are called most often, in Wallonia and in Flanders. For a breakdown, call us and we give you the first available slot, often the same day depending on where you live.
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
Which Vaillant models do you work on?
All the usual ones: ecoTEC plus, ecoTEC pro, ecoTEC exclusive, older turboTEC and atmoTEC boilers, floor-standing models and aroTHERM heat pumps. On very old units, we check parts availability first.
What should I do when my Vaillant shows F28?
Reset it once at most. If the code comes back, call us on 0477 03 88 98: repeated resets can hide a gas or flue issue.
Are you part of Vaillant?
No. We are an independent heating company that repairs and services Vaillant boilers with suitable parts from Belgian wholesalers. If your boiler is still covered by the manufacturer, check their conditions first.
How often must a Vaillant boiler be serviced?
It depends on the Region where you live and on the fuel. We tell you when you book and can remind you later.
Do you work in the evening and at weekends?
Yes, 7 days a week. Any supplement is announced before the engineer sets off.
Repair or replace a 20-year-old Vaillant?
The engineer weighs the condition of the boiler, the cost of the part and the number of past breakdowns, and gives you his honest opinion with both prices.
Can a heat pump replace my Vaillant boiler?
In many homes, yes, alone or in a hybrid setup. We visit first and send a free quote.
Vaillant boiler giving trouble?
Call us for a breakdown, book your service online or ask for a free quote.