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As stated you need an engineer who knows what he or shes doing, I had this fault on my Biasi Garda, read this thread http://www.diynot.com/forums/viewtopic.php?t=117072

Just an update, the new sensor arrived Friday for the DHW, the hot water now works a treat and does seem to work better than when the boiler was new, it possibly could have been faulty from day one ! The boiler has also stopped cycling so can now get a decent nights kip ! Thanks again Tony...

I think he means the diverter valve actuator which is located inside the boiler on the left hand side ?

Yes might try that as it is painfully slow when your trying to fill the bath, might be able to sleep better too as the boiler is upstairs and has been driving me mad of late while its been going through its start up process every few mins. Thanks again Tony & Happy New Year ! Paul

Well was a bit bored this morning so decided to get my digital mutimeter on both the DHW & CH temp probes, it would appear that you were right Tony as this sensor is totally open circuit / intermittent which would activate the frost protection, as a test I got a variable resistor and set it to...

Tony, DHW Temp probe (sensor) has been ordered, will let you know if it has fixed the faults when fitted, cheers paul :D

Ok the boiler is about 4 years old, what's been happening is that when the boiler is on standby (no hot water or ch called for) the boiler keeps on going through a sequence of trying to fire up and shutting down, when it does this the green led on the left hand side of the control panel flashes...