Saunier Duval Repair Service in Mansfield Central

What does error F26 mean on a Saunier Duval Condens boiler?

Error F26 on a Saunier Duval Condens boiler indicates the temperature difference between flow and return water has exceeded the maximum limit. This is a circulation problem. Contact a qualified heating engineer.

What does error code 15 mean on a Saunier Duval Isofast boiler?

Error 15 on a Saunier Duval Isofast boiler indicates a gas mechanism fault affecting the gas valve or gas supply control. 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.

What does error 3 & 0 (also shown as 30) mean on a Saunier Duval Ecosy boiler?

Error 3 & 0 on a Saunier Duval Ecosy boiler (display alternates between 3 and 0, also referred to as code 30) indicates an excessive temperature difference between flow and return water, suggesting poor circulation. Check radiator valves are open and bleed radiators if needed. If the fault persists, contact a Gas Safe registered 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 code 17 mean on a Saunier Duval Themaclassic boiler?

Error 17 on a Saunier Duval Themaclassic boiler indicates the power supply voltage has fallen below 170V. Check if other electrical appliances are affected. For isolated boiler issues, contact a Gas Safe registered engineer.

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.

What should I do if I smell gas near my Saunier Duval boiler?

If you smell gas, do not operate any electrical switches including boiler controls. Open doors and windows to ventilate the area. Turn off the gas supply at the meter if it is safe to do so. Leave the property and call the National Gas Emergency Service immediately from outside. Do not return until a Gas Safe registered engineer has confirmed it is safe.

What should I do if my Saunier Duval boiler shows 0.5bar?

The 0.5bar display indicates that water pressure in your heating system has dropped too low for the boiler to operate correctly. You need to repressurise the system using the filling loop. Open the blue filling tap slowly until the pressure gauge shows between 1 and 2 bar, then close the tap securely.

How do I reset my Saunier Duval boiler after a fault?

For most Saunier Duval boilers, turn the control to the off position (marked "0" on many models), wait 5 seconds, then turn it back to the on position ("I"). For newer models with a dedicated reset button, simply press the reset button once. If the boiler has a summer/winter selector, move it to the reset position until the red LED turns off, then return it to winter position.

How do I use the temperature controls on a Saunier Duval boiler?

Most Saunier Duval boilers have two temperature selectors: one for domestic hot water and one for central heating. For domestic hot water, the range is typically 38°C to 60°C, with an ECO setting suitable for everyday use. For central heating, the range is typically 38°C to 73°C.