Saunier Duval Appliance Repair in Pinhoe

What does error code 18 mean on a Saunier Duval Themaclassic boiler?

Error 18 on a Saunier Duval Themaclassic boiler indicates a user interface fault. The control panel is faulty. Contact a qualified heating engineer as the user interface may need replacement.

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 3 & 1 (also shown as 31) mean on a Saunier Duval Ecosy boiler?

Error 3 & 1 on a Saunier Duval Ecosy boiler (display alternates between 3 and 1, also referred to as code 31) indicates a flow thermistor short circuit. The temperature sensor needs replacement. Switch off the boiler and contact a qualified heating engineer.

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

Error 05 on a Saunier Duval Themaclassic boiler indicates an overheat fault. Switch off the boiler and allow it to cool down completely for at least 30 minutes. Once cooled, press the overheat thermostat reset button. If the fault recurs, contact a qualified heating engineer.

What does error F7 mean on a Saunier Duval Condens boiler?

Error F7 on a Saunier Duval Condens boiler indicates a domestic hot water thermistor fault. The DHW temperature sensor is faulty or not properly attached. Switch off the boiler and contact a qualified heating engineer to inspect the sensor.

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.

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.

Is my Saunier Duval boiler compatible with smart thermostats?

Many Saunier Duval boilers manufactured since 2012 are compatible with smart thermostats via the eBus communication protocol. The manufacturer offers dedicated smart controls that integrate directly with compatible boilers for optimal performance. If using a third-party smart thermostat, check compatibility with your specific boiler model. A qualified heating engineer can advise on the best options for your installation.

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 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.