Hi .could it be that the boiler is on for hot water heating?
Ok . when it appears to come on is the boiler firing? And are bthevpipes getting hot?
No . the pressure is fine, when you have this additional noise is the boiler actually firing up and continuing to heat?
Hi . really need an answer to this last question to be able to continue with the diagnosis , thanks
No, it is not firing. Only the "Central heating ON light" is lit. The "Burner ON Light" is not lit. It is making similar sound though - like it is pumping water through, or a fan is running.
Ok . it sounds like it is the pump over in that is on . this clears heat from the heat exchanger once the programme switches off to stop an overheat. How long does it run for afterwards?
Non-stop, 24 hours a day. This has been happening since Friday.
Ok . sounds like a PCB board malfunction. Will just check them manual . please give me a few mins , thanks
Just checking with baxi as boards are expensive
Hi . sounds like the pump overun . this is operated via the pcb . this will need replacing .
Sorry , have to pop out for an hour
No problem, thanks for your help. It's still under warranty, so I'll call them for a visit.