Saunier Duval Thelia 23E Fault codes & diagnostics

Your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.

Your boiler has failed to light because it is not receiving gas or cannot sense the flame, so it has safely shut itself down to prevent a gas buildup.

Your boiler is not detecting that the air extraction system is working correctly, so it has safely shut down to prevent unsafe operation.

Your boiler's internal water pressure is currently too high, which can cause the safety valve to leak or performance issues.

Your boiler has detected that it is running too hot and has automatically shut down to prevent damage to its internal parts.

Your boiler has lost the ability to measure the temperature of the water it is heating, so it has stopped working as a safety precaution.

Your boiler is unable to read how much water is inside the system, so it has safely shut down to prevent damage.

Your boiler's main control panel is failing to communicate with the internal computer, which is preventing the system from starting up.

Your boiler is having trouble communicating with the digital control panel, which means it cannot receive instructions to heat your home or water.

Your boiler's central control computer has encountered an internal error and cannot communicate with the system to operate your heating or hot water.

Your boiler has detected that the water inside the unit is getting dangerously hot and has shut itself down to prevent damage.

Your boiler is having trouble controlling the flow of gas necessary to ignite the flame, meaning it cannot provide heat or hot water.

Your boiler is receiving an insufficient electrical voltage from your home supply, meaning it lacks the power needed to operate correctly.

Your boiler's control panel is having trouble communicating with the main internal computer, which is preventing the system from operating correctly.

Your boiler has lost the connection to a sensor that monitors the water temperature, meaning it has safely shut down to prevent overheating.

Your boiler is struggling to communicate with its control panel, meaning it does not recognize the device used to adjust your settings.

Your boiler is attempting to start but failing to keep the flame lit, which means it will stop providing heating and hot water for safety reasons.

Your boiler is failing to stay lit because it cannot confirm that the flame has actually started, causing it to shut down for your safety.