Saunier Duval Repair Service in Oakham and Bellamy

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.

What does error code 11 mean on a Saunier Duval Isofast boiler?

Error 11 on a Saunier Duval Isofast boiler indicates a pump blockage. The circulation pump is blocked or not operating. Contact a qualified heating engineer as the pump may need repair or replacement.

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

Error 05 on a Saunier Duval Isofast boiler indicates overheating. Switch off the boiler and allow it to cool down completely for at least 30 minutes before resetting. If the fault recurs, contact a qualified heating engineer.

What does error code 12 mean on a Saunier Duval Themaclassic boiler?

Error 12 on a Saunier Duval Themaclassic boiler indicates a user interface or main board reception fault. The display unit is not communicating correctly with the main circuit board. Switch off the boiler and contact a Gas Safe registered engineer.

What does error F27 mean on a Saunier Duval Condens boiler?

Error F27 on a Saunier Duval Condens boiler indicates a vortex sensor fault. The sensor that monitors the venturi tube in the gas-air mixing system is faulty. Switch off the boiler and contact a Gas Safe registered engineer.

What safety devices does a Saunier Duval boiler have?

Saunier Duval boilers include several safety devices: an overheat thermostat that automatically shuts down the boiler if temperatures become excessive, an air flow safety device that turns the boiler off if flue obstruction is detected, automatic shutdown during power failures (with automatic restart when power returns), and frost protection to prevent freezing in cold conditions.

What sounds are normal from a Saunier Duval boiler?

Normal sounds include a gentle humming from the fan when the boiler is running, clicking sounds when the boiler ignites or switches between heating and hot water modes, and quiet water flow sounds. Concerning sounds that require professional attention include loud banging or kettling noises (which may indicate limescale buildup), persistent vibrating, grinding from the fan or pump, or any unusual rattling. If you hear concerning noises, switch off the boiler and contact a Gas Safe registered engineer.

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.

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.

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.