Saunier Duval Appliance Repair in Northgate & West Green

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

Error 15 on a Saunier Duval Themaclassic boiler indicates a gas mechanism fault. 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 F22 mean on a Saunier Duval Condens boiler?

Error F22 on a Saunier Duval Condens boiler indicates high water pressure - the system pressure has exceeded 2.7 bar. This may be caused by overfilling or a faulty expansion vessel. You may need to release some pressure via a radiator bleed valve. If unsure or the fault persists, contact a Gas Safe registered engineer.

What does error F11 mean on a Saunier Duval Condens boiler?

Error F11 on a Saunier Duval Condens boiler indicates a user interface connection fault. There is a wiring problem between the main board and control panel. Contact a Gas Safe registered engineer to check the connections.

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 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.

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.

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.

How often should I have my Saunier Duval boiler serviced?

Saunier Duval recommends having your boiler serviced annually by a Gas Safe registered engineer. This regular maintenance helps ensure continued efficient and safe operation. A more comprehensive strip-down service is recommended every 5-6 years to inspect internal components more thoroughly.

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.

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.