Gas Boiler and Aerothermal Repair in Barcelona | 24h Emergency

Modern boilers have sophisticated electronic boards that display error codes (F28, EA, 104, etc.) on their digital displays. However, an error code only indicates the symptom, not the root cause. For example, an ignition failure can be due to lack of gas supply, a dirty electrode, a broken ignition transformer, or the motherboard itself fried by a power surge.

Our repair protocol doesn't consist of changing parts at random until it works. We use multimeters to measure voltages and resistances on NTC sensors, differential gas manometers to check the dynamic pressure of the injector, and combustion analyzers to verify the air/gas mixture ratio. This level of precision allows us to diagnose the exact problem in under 30 minutes, drastically reducing the final repair cost by avoiding replacing parts that work correctly.

If you live in old buildings in Eixample or Gràcia, your boiler is likely to suffer from water pressure issues. Two components that fail most often are the expansion vessel and the 3-way valve.

The expansion vessel contains a membrane with nitrogen under pressure. Its function is to absorb the increase in water volume when heated. If it deflates or punctures, the circuit pressure rises quickly when heating is turned on (exceeding 3 bar) and the safety valve releases water. We repair this problem by reinjecting nitrogen or replacing the vessel.

The 3-way valve is the boiler's 'traffic light': it decides whether hot water goes to the radiators or the shower tap. When it blocks (often due to limescale or sludge buildup in the heating circuit), you can have heating but no hot water, or vice versa. To avoid this wear, we strongly recommend an annual preventive maintenance and the installation of magnetic sludge filters.

Blockages due to flue outlet failure are critical for safety reasons. If your boiler's air pressure switch detects that gases are not being properly evacuated, it instantly locks the burner to prevent carbon monoxide poisoning inside the property.

This fault can be caused by a burnt-out extraction fan, an obstructed outlet pipe (bird nests on the facade, leaves), or in condensing boilers, a frozen or blocked condensate drain pipe. Our technicians fully inspect the entire evacuation duct and use certified carbon monoxide detectors to ensure the repair leaves the boiler in optimal safety conditions according to the strict Industry and Energy regulations of Catalonia.

Aerothermal is refrigeration technology, not gas. Therefore, its repair requires different tools and certifications (RITE Certificate + Fluorinated Gases Handler). We diagnose performance drops due to refrigerant gas leaks (R32 or R410A), inverter plate failures in the external compressor, or misconfigurations in the heating curves of the control unit. We also repair mixing valves and support resistors of inertia tanks, ensuring your high-efficiency system continues to save like the first day.