BoilerFaultCodesWhat the manual says
Manufacturer manual‘RUNNING’
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; the green light indicates that the boiler's internal controls have successfully received a signal to operate. It physically confirms that the burner is lit and the system is currently delivering heat to your radiators or hot water to your taps. If this light is on, the boiler is performing its job exactly as intended.
DIY fix possible
This fault may be fixable without an engineer. Check your manual first.
Find a Gas Safe engineer
Search the official register →
Boiler cover options
Avoid the next call-out bill
A cover plan would handle faults like Green Light: no call-out fees, no surprise bills.
Approved partner
Get a quote →
Domestic Appliance Guard
Unlimited call-outs, 24/7 helpline, no price-hike promise
Affiliate links. We may earn a commission at no extra cost to you.
All 11 fault codes on the Swiftflow 100
Seeing a different code? Every code this model can display, in one place.