Biasi M96.28 Silver intemittent fault

[DiamondDog]

Hi I have a problem with a Biasi boiler that fires up for nigh on 5 mins (CH) all seemingly as it should be but then keeps cutting in/out with 1 and 3 green lights flashing from fire up to fault.

DHW works absolutely fine?

 

[James1991]

If it only faults on heating mode then it's probably the heating ntc sensor.

 

[Agile]

Its not the 1 and 3 lights which we need to know. That is just a demand for heat and alternately flashing is for hot water.

Its what it does at the fault that shows what the boiler thinks is wrong.

If DHW is fine and the 1 and 3 keep flashing and it just the burner goes off then it may be a blockage or restriction on the heating circuit. Any filters fitted?

Tony