What the manual says
Manufacturer manualDHW mode: Ignition. The ignition for domestic hot water mode is activated.
What causes this fault?
This is a normal status code rather than a fault, occurring every time you turn on a hot tap. It indicates that the boiler's internal computer has successfully detected a request for hot water and is now physically sparking the burner to heat it. Once the flame is established and the water reaches the set temperature, this code will typically transition to another status.
DIY fix possible
This fault may be fixable without an engineer. Check your manual first.
Avoid the next call-out bill
A cover plan would handle faults like S.23: no call-out fees, no surprise bills.
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