Fast technical service
If your boiler has stopped working, the last thing you need is to wait. At JAG Alcaide we attend boiler and water heater breakdowns in Barcelona with our own technicians, no middlemen. 90% of the breakdowns we attend are resolved on the first visit.
We repair all brands: Junkers, Bosch, Vaillant, Baxi, Ariston, Ferroli, Fagor and others. We are an official Junkers Bosch service centre.
Most common boiler faults — Do you recognise your problem?
If your fault is not in the table or you are not sure, call us on 932 185 847 and we will advise you before sending a technician.
| Symptom | Most likely cause | Can you fix it yourself? |
|---|---|---|
| Boiler won’t start | Low pressure, ignition failure or thermostat off | Sometimes (see checks below) |
| Constantly losing pressure | Micro-leak in the circuit or faulty expansion vessel | No — technician required |
| Hot water but no heating | Stuck three-way valve | No — technician required |
| Strange noises (banging, whistling) | Limescale build-up in the heat exchanger | No — professional cleaning required |
| Starts then shuts off | Faulty temperature sensor or overheating | No — diagnosis required |
| Error code on display | Depends on code and brand | Check manual or call us |
| Smell of gas | Possible gas leak in the installation | Call Gas Natural and ventilate immediately |
How much does a boiler repair cost?
It is difficult to give an exact price without seeing the appliance, but these are the typical ranges for the most common repairs:
| Type of repair | Approximate cost (labour + callout) |
|---|---|
| Diagnosis + basic checks | €60–80 |
| Pressure recharge + leak check | €80–120 |
| Three-way valve replacement | €120–180 + part |
| Heat exchanger cleaning | €100–150 |
| Temperature sensor or thermostat replacement | €90–140 + part |
| Circuit board replacement | €150–250 + part |
Spare parts are quoted separately once the fault has been diagnosed. We always confirm the cost before starting any work.
Tip: if you have a maintenance contract with us, labour and callout costs for all breakdowns are already included. Find out about our maintenance contracts.
At JAG Alcaide we offer a boiler and heater repair service, as well as technical assistance for any type of breakdown in your gas or electricity installation. To guarantee a more efficient service in the repair of your boiler, it would be advisable that before calling our technical assistance service you carry out the following checks:
In the event that after carrying out these checks the fault persists, contact us through the assistance request that we attach below or by calling 932 185 847 and we will send you an expert as soon as possible.
Technical assistance form
Frequently asked questions about boiler repair
Do you repair all boiler brands? Yes. We work with all major brands. We are an official Junkers Bosch service centre, but we also repair Vaillant, Baxi, Ariston, Ferroli, Fagor and others without any problem.
Do you offer an emergency service? Out-of-hours emergency service is available during the winter period (October to April) for clients with a maintenance contract. For other clients, we attend as quickly as possible during working hours (Monday to Friday, 8am to 6pm).
Do you provide a quote before carrying out repairs? Always. The technician diagnoses the fault and confirms the estimated cost before starting any work. If you decide not to proceed, only the diagnostic visit is charged.
What happens if the repair requires a part that is not in stock? We will inform you of the delivery time and, where possible, keep the boiler running with a temporary fix while the part arrives.
Is it worth repairing or better to replace the boiler? It depends on the age of the boiler and the type of fault. As a general rule, if the boiler is less than 12–15 years old and the repair does not exceed 40% of the cost of a new one, it is worth repairing. We will advise you during the visit with no obligation.