BoilerFaultCodesTechnical description
DHW temperature selected (by knob). Adjust if required - 55°C recommended. Range: 65°C(winter) - 45°C(summer)
What causes this fault?
This is not a mechanical failure but rather a status notification triggered when the user-adjustable hot water control knob is turned. It appears to confirm the specific target temperature you have set for your taps and showers, ensuring the boiler heat exchanger knows exactly how much to heat the water.
This code is often seen during the transition between seasons when homeowners adjust the dial higher for winter comfort or lower for energy saving in summer.
DIY fix possible
Locate the domestic hot water (DHW) control knob on the boiler panel.Turn the knob to your desired temperature, ideally around 55°C for standard use.Check that the display updates to your new selection and then returns to the normal operating screen.