Viessmann Boiler Repairs Swansea & South Wales

Viessmann boiler logo

Viessmann is a premium German heating manufacturer founded in 1917. Renowned for engineering excellence, their Vitodens range is widely regarded as one of the finest domestic boiler series available in the UK. Viessmann boilers use stainless steel Inox-Radial heat exchangers that deliver exceptional efficiency and longevity. Our engineers in Swansea and South Wales are trained in Viessmann systems and understand their advanced controls and diagnostic technology.

Viessmann Boiler Repair

When your Viessmann boiler breaks down, you need an engineer who knows the brand inside out. Our Gas Safe Registered engineers have repaired hundreds of Viessmann boilers across Swansea and South Wales. We carry common replacement parts on our van, which means many Viessmann repairs can be completed on the first visit — getting your heating and hot water back up and running as quickly as possible.

Common Viessmann Boiler Problems

Through years of working on Viessmann boilers, we have become familiar with the faults these models are most prone to. Here are the issues we see most often:

  • A9 error code — burner fault or flame signal loss, often caused by the ionisation electrode
  • F5 error code — outdoor sensor fault on weather-compensated installations
  • Low pressure warnings — expansion vessel or PRV issues causing the system to lose pressure
  • Condensate pipe freezing — the external condensate pipe can freeze in severe winter weather
  • Pump blocking after long idle — the internal pump can seize if the boiler sits unused over summer
  • Communication faults — the Vitotronic control unit can lose connection with external controls

If your Viessmann boiler is displaying a fault code or behaving unusually, do not ignore it. Early diagnosis can prevent a minor issue from becoming an expensive repair.

Viessmann Boiler Servicing

An annual boiler service is essential for keeping your Viessmann boiler running safely and efficiently. During a service, we carry out a comprehensive set of checks including flue gas analysis, gas pressure testing, electrical connection inspection and a full visual examination of all components. Regular servicing not only extends the life of your Viessmann boiler but is also a requirement for maintaining most manufacturer warranties.

Viessmann Models We Work On

We service and repair the full range of Viessmann boilers, including:

  • Viessmann Vitodens 050-W
  • Viessmann Vitodens 100-W
  • Viessmann Vitodens 111-W
  • Viessmann Vitodens 200-W
  • Viessmann Vitodens 222-F

Even if your specific Viessmann model is not listed above, we can almost certainly help. Our engineers have experience with both current and discontinued Viessmann boilers.

Viessmann Boiler Installation

As well as repairs and servicing, we install new Viessmann boilers throughout Swansea, Neath, Port Talbot and the surrounding areas. Whether you are replacing an old boiler or fitting a Viessmann boiler in a new location, we handle the complete installation including any necessary pipework modifications, flue fitting and system flushing. We will help you choose the right Viessmann model for your property size and hot water demands, and ensure everything is installed to manufacturer specifications and Gas Safe standards.

We also specialise in Vaillant, Worcester and Keston boiler repairs across South Wales.

For Viessmann boiler repairs, servicing or installation across South Wales, call us on 07881 286 602. We cover Swansea, Llanelli, Carmarthen, Neath, Port Talbot and surrounding areas. See our boiler installation service, browse all brands we work with, or get in touch for a free quote.