BoilerFaultCodesWhat the manual says
Manufacturer manualDHW set temperature: Setting value of the hot water temperature demanded by the heating controller.
What causes this fault?
This fault occurs when your external thermostat or heating app sends a temperature command that the boiler doesn't recognize or can't process. The most common reason is a communication glitch or a software mismatch between your wireless controller and the boiler's internal computer.
DIY fix possible
Check your thermostat or heating app to ensure the hot water temperature is set to a normal level (typically 50-60°C).Turn the boiler off and back on at the main isolation switch to reset the communication between the controller and the boiler.Ensure any smart home batteries in your thermostat are not low, as this can cause communication errors.
Avoid the next call-out bill
Monthly cover means no unexpected bills when your boiler breaks down.
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