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 Cambridgeshire.
No hot water or heating?
Saunier Duval heating breakdowns repaired fast by Gas Safe engineers. Available seven days a week across Cambridgeshire.
Climate Control
F-Gas certified engineers for Saunier Duval air conditioning. Installation, fault diagnosis and refrigerant handling across Cambridgeshire.
Air conditioning not cooling?
Saunier Duval climate control repairs by certified engineers. Same-day response available across Cambridgeshire.
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 Cambridgeshire.
Renewable Energy
Professional Saunier Duval solar panel repair service in Peterborough. Certified technicians with genuine spare parts and a written warranty.
Heat pump underperforming?
Specialist Saunier Duval renewable energy engineers. MCS-accredited service across Cambridgeshire.
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 F20 mean on a Saunier Duval Condens boiler?
Error F20 on a Saunier Duval Condens 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 F17 mean on a Saunier Duval Condens boiler?
Error F17 on a Saunier Duval Condens boiler indicates the power supply has fallen below 170V. Check if other electrical appliances are affected. For isolated boiler issues, 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 F10 mean on a Saunier Duval Condens boiler?
Error F10 on a Saunier Duval Condens boiler indicates a central heating return thermistor fault. The return temperature sensor or cable is defective. Switch off the boiler and contact a qualified heating engineer to inspect and replace the thermistor.
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.
Frequently Asked Questions
What is included in a Saunier Duval boiler service?
A typical annual service includes operating the boiler to check for faults, inspecting the burner and heat exchanger, cleaning components as needed, checking the flue system for obstructions and secure fittings, verifying correct gas pressures, testing safety devices, and checking all gas connections for leaks using detection fluid.
What is the correct pressure for a Saunier Duval boiler?
The normal operating pressure for a Saunier Duval boiler should be between 1 and 2 bar. When measured cold with the boiler off, the ideal pressure is between 1.0 and 1.5 bar. If pressure falls below 0.5 bar, the boiler will display a low pressure warning. If pressure exceeds 2.7 bar, this indicates overpressure.
Why does my Saunier Duval boiler provide heating but no hot water?
If your boiler provides heating but not hot water, the most likely cause is a faulty diverter valve (also called a 3-way valve). This valve directs hot water either to the radiators or to the hot water outlet, and when it fails it may become stuck in the heating position. Other possible causes include a faulty hot water temperature sensor or a problem with the boiler controls. Contact a Gas Safe registered engineer to diagnose and repair the issue.
What is the pre-heating or WARM START function on a Saunier Duval boiler?
The WARM START or pre-heating function reduces waiting time when you turn on a hot water tap. In ON mode, the boiler maintains the heat exchanger at the required temperature between 5am and 11pm for instant hot water. In AUTO mode, the boiler learns your household patterns and pre-heats just before your typical first use of the day. In OFF mode, this function is disabled and you may experience a short delay before hot water arrives.
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.
Areas We Cover in Cambridgeshire
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.