BoilerFaultCodesTechnical description
The boiler is modulating upwards
What causes this fault?
This code appears when the boiler needs to generate more heat to reach the temperature requested by your thermostat or hot water taps. It is a sign that the internal burner is simply ramping up its intensity to meet the current demand. It does not indicate a system failure or a broken part.
DIY fix possible
No action is required as this code is an operational status indicator.Monitor the display to see if the code clears once the temperature stabilizes.If the boiler appears stuck on this code without producing heat, try a simple reset.
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