Saunier Duval Appliance Repair in Three Bridges

What does error F6 mean on a Saunier Duval Condens boiler?

Error F6 on a Saunier Duval Condens boiler indicates a central heating flow thermistor fault. The temperature sensor or its wiring may be defective. Switch off the boiler and contact a Gas Safe registered engineer to inspect and replace the thermistor if necessary.

What does error code 05 mean on a Saunier Duval Themaclassic boiler?

Error 05 on a Saunier Duval Themaclassic boiler indicates an overheat fault. Switch off the boiler and allow it to cool down completely for at least 30 minutes. Once cooled, press the overheat thermostat reset button. If the fault recurs, contact a qualified heating engineer.

What does error code 20 mean on a Saunier Duval Themaclassic boiler?

Error 20 on a Saunier Duval Themaclassic boiler indicates software incompatibility between components. This can occur after incorrect replacement parts are installed. Contact a qualified heating engineer to install compatible components.

What does error 1 & 8 (also shown as 18) mean on a Saunier Duval Ecosy boiler?

Error 1 & 8 on a Saunier Duval Ecosy boiler (display alternates between 1 and 8, also referred to as code 18) indicates the flow temperature has exceeded 100°C. This is a serious overheating condition. Switch off the boiler immediately and allow it to cool down completely for at least 30 minutes. Contact a Gas Safe registered engineer immediately.

What does error F24 mean on a Saunier Duval Condens boiler?

Error F24 on a Saunier Duval Condens boiler indicates the return heating temperature has exceeded 90°C. This may indicate poor pump operation, lack of water circulation, or closed heating valves. Switch off the boiler and allow it to cool for at least 30 minutes. Contact a Gas Safe registered engineer to diagnose the circulation issue.

How does frost protection work on Saunier Duval boilers?

Saunier Duval boilers include built-in frost protection that automatically activates if the boiler is left unattended in cold conditions. The frost protection device will light the boiler when the temperature of the boiler water falls below 6°C. When the temperature reaches 16°C, the boiler stops. This cycle repeats as needed to prevent the system from freezing. For frost protection to function, the boiler must remain connected to the electrical supply and have gas available.

What should I do if my Saunier Duval boiler keeps losing pressure?

If your boiler frequently needs repressurising, there is likely a leak somewhere in the heating system. Check visible pipework, radiator valves, and connections for any signs of water. The pressure relief valve may also be discharging water if the system is overpressurised or the expansion vessel has failed.

How often should I have my Saunier Duval boiler serviced?

Saunier Duval recommends having your boiler serviced annually by a Gas Safe registered engineer. This regular maintenance helps ensure continued efficient and safe operation. A more comprehensive strip-down service is recommended every 5-6 years to inspect internal components more thoroughly.

What should I do if my Saunier Duval boiler shows 2.7bar?

The 2.7bar display indicates that water pressure has exceeded the safe operating limit. Excessive pressure can damage boiler components and may cause the pressure relief valve to discharge water. You may need to release some water from the system via a radiator bleed valve to reduce pressure.

Should I leave my Saunier Duval boiler on all the time?

Modern condensing boilers like those from Saunier Duval are designed to be efficient when running on demand. Using a room thermostat and programmer to control when heating is on is generally more efficient than leaving the boiler running continuously. However, the boiler should remain powered on (even in summer) so that frost protection can activate if needed.