Vaillant Group • Founded 1874 • Germany
Vaillant boiler repair and spare parts in Madrid
Specialized technical service for the complete Vaillant range in Madrid and metropolitan area. Diagnosis, repair, and spare parts for ecoTEC, atmoTEC, turboTEC boilers and air conditioning systems.
💡 Direct response
Vaillant is a German air conditioning company founded in 1874 in Remscheid. It is the largest European manufacturer of condensing boilers under its own brand. Its range ecoTEC dominates the new construction market in Spain and reaches up to the 109% thermal efficiency. Common ranges in Madrid: ecoTEC plus (condensation), ecoTEC pro, atmoTEC și turboTEC.
🏆 Independent manufacturer
Vaillant Group is not publicly traded. It guarantees its own spare parts policy for up to 15 years after discontinuation.
⚡ Up to 109% efficiency
ecoTEC plus boilers class A++. Compatible with ambiGO smart thermostat and arotherm heat pumps.
📦 Spare parts in stock
Original and approved equivalents. Express shipping 24-48h throughout Spain.
Vaillant product range
Condensing boilers
- ecoTEC plus (VU, VUW) – condensation class A++. The most installed in new constructions in Madrid since 2010.
- ecoTEC pro (VU, VUW) – A+ class condensing. Compact design, entry-level condensing range.
- ecoCOMPACT (VSC) – wall-mounted boiler with integrated buffer tank, for installations with low flow rate.
- ecoFIT pure - Compact condensing for replacing atmospheric units. Highly demanded in renovations.
Standard and conventional boilers
- turboTEC plus / pro (VUW) – standard forced draught. Highly popular in Madrid 1995‑2012, many still in operation.
- atmoTEC plus / pro (VMW) – natural draught. Classic model, requires a conventional chimney.
- atmoTEC exclusive – high-end conventional range with advanced DHW and heating functions.
Climate control systems
- arotherm plus – Air-to-water heat pump for heating and DHW. Compatible with any Vaillant boiler.
- flexoTHERM – Ground-water heat pump. High efficiency in extreme climates.
- allSTOR / unistor – buffer tanks and DHW accumulators for hybrid systems.
Most common fault codes
The Vaillant display shows codes with the letter F (fault) or d (diagnosis). The most common ones in Madrid:
| Code | Meaning | Common cause |
|---|---|---|
| F.22 | Insufficient pressure | Water below 0.5 bar: refill the circuit or repair the leak |
| F.28 | Ignition fault | Gas cut off, defective electrode or gas valve |
| F.29 | No re-ignition | Dirty ionization electrode or control board |
| F.62 | Flue gas safety time | Blocked extractor or faulty flue gas sensor |
| F.75 | No pressure detection | Circulator pump or faulty pressure sensor |
| F.77 | Condensate system | Condensate hose blocked or condensate pump |
| F.83 | Low temperature at start | Defective return NTC sensor or no water in the circuit |
Vaillant spare parts: own stock and 24-hour delivery
We maintain stock of the most demanded spare parts for the entire Vaillant range. Unavailable parts are located and shipped within 24-48 hours home delivery throughout Spain:
- PCBs (ecoTEC, turboTEC, atmoTEC)
- Circulator pumps and hydraulic groups
- NTC sensors for heating, DHW, and flue gases
- Gas valves and three-way valves
- Extractors, fans, and ignition electrodes
- Heat exchangers and gaskets
- Maintenance kits and filters
Frequently Asked Questions about Vaillant Boilers
The most common questions we receive about Vaillant boilers, answered clearly:
Vaillant is a German family-owned company founded in 1874 in Remscheid (Germany). It is the largest European manufacturer of boilers with its own brand, not listed on the stock exchange. It manufactures in Germany, France, and the Czech Republic. In Spain, it also markets the brand Saunier Duval, which shares a technical platform.
With annual maintenance, a Vaillant boiler can last between 15 and 25 yearsCondensing models like the ecoTEC have greater electronic complexity but higher efficiency. Conventional series like the turboTEC are very robust and remain operational for many years if properly maintained.
F.28 indicates ignition faultThe boiler has attempted to ignite 3 times unsuccessfully and has locked out for safety. The most common causes are: gas shut off at the stopcock, insufficient gas pressure, worn ignition electrode, or defective gas valve. Reset the boiler with the on/off button and if it recurs, call a technician.
The ecoTEC plus It is a high-efficiency condensing (class A++), recovers the latent heat from the gases and can save up to 30% in gas compared to a conventional one. The turboTEC It is standard (class B/C), simpler and cheaper to install. For an average home in Madrid, the investment in a condensing boiler is recouped in 4-7 years through gas savings.
Progressive loss of pressure indicates a leak in the circuit (gaskets, radiators, connections) or a expansion vessel depletedThe leak can be internal (inside the boiler) or external. If the pressure drops more than 0.3-0.5 bar in less than a week without refilling, an inspection is necessary. Do not refill repeatedly without locating the source.
The manufacturer recommends and Spanish regulations require annual inspection. Includes cleaning of the heat exchanger, combustion verification, flue gas evacuation check, and issuance of the official certificate. In communities with a central boiler, it is mandatory. Pre-winter maintenance (September-October) ensures the boiler is ready before the cold.
The model and serial number are on the rating plate (lower front or side of the boiler). The code follows the format VU/VUW + power in kW + suffix. For example, VUW 246/5-5 indicate 24 kW combi boiler, generation 5. If you can't read it, send us a photo by contact and we identify the model.
Does your Vaillant boiler need servicing?
Please provide the model and the fault code if it appears on the panel. We will guide you before the visit.