BoilerFaultCodesWhat the manual says
Manufacturer manualIndicates the appliance is running/operational (typically during hot water demand).
Shared across the Swiftflow 100 range
This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.
What causes this fault?
This is not a fault, but rather a positive status indicator showing that the boiler is actively burning gas to generate heat. It appears when you turn on a hot tap or when your thermostat signals that the house needs warming up. Once the demand for heat or hot water is met, this light will typically turn off as the boiler enters standby mode.
DIY fix possible
This fault may be fixable without an engineer. Check your manual first.
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All 11 fault codes on the Swiftflow 100
Seeing a different code? Every code this model can display, in one place.