Saunier Duval Appliance Repair Service
Specialist repairs using genuine Saunier Duval spare parts
Heating
Gas Safe registered engineers for Saunier Duval boiler and hot water cylinder. Fault diagnosis, part replacement and annual servicing across Nottinghamshire.
No hot water or heating?
Saunier Duval heating breakdowns repaired fast by Gas Safe engineers. Available seven days a week across Nottinghamshire.
Climate Control
F-Gas certified engineers for Saunier Duval air conditioning. Installation, fault diagnosis and refrigerant handling across Nottinghamshire.
Air conditioning not cooling?
Saunier Duval climate control repairs by certified engineers. Same-day response available across Nottinghamshire.
Renewable Energy
MCS-accredited installation and repair for Saunier Duval heat pump, air water heat pump and solar panel. Heat pump diagnostics, refrigerant handling and efficiency optimisation.
Heat pump underperforming?
Specialist Saunier Duval renewable energy engineers. MCS-accredited service across Nottinghamshire.
Renewable Energy
Professional Saunier Duval solar panel repair service in Mansfield. Certified technicians with genuine spare parts and a written warranty.
Heat pump underperforming?
Specialist Saunier Duval renewable energy engineers. MCS-accredited service across Nottinghamshire.
Why Saunier Duval Appliances Need Specialist Repair
Saunier Duval appliances incorporate advanced proprietary systems that require certified engineers with brand-specific training to diagnose and repair correctly.
Saunier Duval appliances use integrated electronic diagnostics. Our engineers connect directly to Saunier Duval control boards using brand-specific tools to read fault codes and pinpoint issues accurately.
Every repair uses genuine Saunier Duval spare parts sourced directly from authorised distributors. Original components ensure compatibility, performance and longevity — backed by a manufacturer warranty.
Saunier Duval appliances must meet strict UK safety regulations. Our certified engineers follow Saunier Duval service procedures and test every repair to BS EN standards before sign-off.
Many Saunier Duval appliances feature Wi-Fi connectivity and smart home integration. Our engineers can diagnose firmware issues, reset connectivity modules and restore remote control functionality.
Common Saunier Duval Error Codes
What does error code 06 mean on a Saunier Duval Isofast boiler?
Error 06 on a Saunier Duval Isofast boiler indicates a central heating flow NTC sensor fault. The temperature sensor is faulty or disconnected. Switch off the boiler and contact a Gas Safe registered engineer.
What does error code 10 mean on a Saunier Duval Isofast boiler?
Error 10 on a Saunier Duval Isofast boiler indicates a fan fault. The fan may be blocked or faulty. Contact a Gas Safe registered engineer and do not use the boiler until resolved.
What does error 2 & 8 (also shown as 28) mean on a Saunier Duval Ecosy boiler?
Error 2 & 8 on a Saunier Duval Ecosy boiler (display alternates between 2 and 8, also referred to as code 28) indicates the fan is stationary or not sending a speed signal. The fan may be blocked or faulty. Switch off the boiler and contact a Gas Safe registered engineer.
What does error F19 mean on a Saunier Duval Condens boiler?
Error F19 on a Saunier Duval Condens boiler indicates the central heating thermistor is unplugged. The sensor is not connected properly. Switch off the boiler and contact a Gas Safe registered engineer to secure the connection.
What does error code 16 mean on a Saunier Duval Themaclassic boiler?
Error 16 on a Saunier Duval Themaclassic boiler indicates a gas safety valve failure. This is a serious gas safety issue. Do not use the boiler. Switch it off at the power supply immediately. If you smell gas, do not operate any switches, ventilate the area if safe to do so, leave the property and call the Gas Emergency Service from outside. Contact a Gas Safe registered engineer immediately.
Frequently Asked Questions
How do I set my Saunier Duval boiler for a holiday or extended absence?
If you have a programmable thermostat or controller, use the holiday mode function to maintain a low temperature while you are away. If your thermostat does not have a holiday mode, simply lower the room thermostat to a minimum setting that prevents freezing, typically around 10°C. Keep the boiler powered on so frost protection remains active. Never turn off the gas supply during cold weather as this disables frost protection.
Why does my Saunier Duval boiler provide hot water but not heating?
The most common causes are: the boiler may be set to summer mode (hot water only), the room thermostat may be set too low, thermostatic radiator valves may be turned down or off, or there may be a fault with the diverter valve (3-way valve) which directs hot water between the heating circuit and hot water outlet.
How can I improve the efficiency of my Saunier Duval boiler?
Maintain correct system pressure (1-1.5 bar cold), bleed radiators regularly to remove trapped air, set heating and hot water temperatures appropriately for your needs rather than at maximum, and ensure the boiler is serviced annually. Use the summer mode during warmer months when heating is not required. Keep the area around the boiler clear for proper ventilation.
How do I bleed radiators when I have a Saunier Duval boiler?
Switch off the boiler and allow the system to cool. Check the boiler pressure is between 1 and 1.5 bar. Starting with the radiator nearest the boiler, use a radiator key to open the bleed valve until you hear air escaping. Close the valve as soon as water begins to flow. Repeat for each radiator in your home. After bleeding all radiators, check the boiler pressure gauge and repressurise if necessary.
How do I switch my Saunier Duval boiler between summer and winter modes?
The summer/winter switch allows you to disable central heating while keeping hot water available. In winter mode, both heating and hot water functions are active, with domestic hot water having priority. In summer mode, central heating is disabled but hot water remains available. The location and type of switch varies by model - it may be a lever, rotary switch, or push button.
Areas We Cover in Nottinghamshire
Saunier Duval appliance repair service across the ten largest towns in the county
Other Vaillant Group Brands
Appliances from other brands in the same corporate group are also repaired
Book a Saunier Duval Repair
Specialist Saunier Duval engineers. No-obligation quote.