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James I
James I, Plumber
Category: UK Plumbing
Satisfied Customers: 112
Experience:  Director at Secure ITC Soltuions
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I have a Biasi Garda Plus HE boiler, to get hot water I have

Customer Question

Hi I have a Biasi Garda Plus HE boiler, to get hot water I have to manually fire up the heating then turn on the hot tap to get hot water. the flow sensor and the 2 temperature probes have been replaced but I am still having the problem. some days when you turn on the tap you have hot water and later the same day we have to go through the turning on the heating before we can get hot water.
Submitted: 2 months ago.
Category: UK Plumbing
Expert:  James I replied 2 months ago.

Hi Peter,

Intermittent faults are very challenging to fault find.

If you turned on the hot tap when the fault is present does the boiler attempt to start (can you hear the van starting for example) and does it show any error codes?

To my mind this type of fault would be down to a faulty relay on the control board, if you have already replaced the flow sensor its clearly not acting on the input for demand of hot water.

Customer: replied 2 months ago.
The fan starts but there is no ignition sound, no error codes show.
Expert:  James I replied 2 months ago.

The fact the fan starts suggests the PCB is detecting input from the flow sensor, but then not invoking the ignition sequence.

Taking into account the boilers starts first time for CH and your not getting a fault \ lock out codes rules out other sensors and electrodes, and would be confident that the fault lies with the PCB.

A new PCB costs around £150, you would need a gas safe engineer to attend to replace the part, however based on the cost of the part I would be inclined to go for a fixed price repair and protect plan, SSE do one see the bottom of the page here.

Should you prefer me to recommend a local engineer please provide you postcode.