Saunier Duval Appliance Repair in Quedgeley Fieldcourt

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 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 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.

What does error code 19 mean on a Saunier Duval Themaclassic boiler?

Error 19 on a Saunier Duval Themaclassic 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 09 mean on a Saunier Duval Themaclassic boiler?

Error 09 on a Saunier Duval Themaclassic boiler indicates a water pressure sensor fault. Check the pressure gauge on your boiler. If pressure appears normal but the fault persists, contact a Gas Safe registered engineer.

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.

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 do I repressurise my Saunier Duval boiler?

Before approaching the boiler, ensure there is no smell of gas. Locate the filling loop underneath your boiler - this is typically a flexible silver hose with two taps or valves. Ensure the boiler is switched off and has cooled down. Open both filling loop taps slowly to allow water into the system. Watch the pressure gauge and fill until it shows between 1 and 1.5 bar. Close both taps securely once the correct pressure is reached.

What does the condensate pipe do and can it freeze?

The condensate pipe carries acidic water produced during the condensing process safely away from the boiler to a drain. In cold weather, this pipe can freeze if it runs externally, causing the boiler to shut down with a fault code. To help prevent freezing, ensure external condensate pipes are adequately insulated. If the pipe does freeze, you may carefully pour warm (not boiling) water over the frozen section to thaw it, then reset the boiler. If freezing recurs frequently, ask a heating engineer about rerouting the pipe internally.

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.