Noisy Alpha 280 boiler

[fordy52]

Hi
I have an Alpha 280 boiler about 5 years old it makes a high pitch whine intermittently, If I turn the boiler off it sounds like a dry bearing that’s tight at first I thought it was the motor so fitted a new one its still there after the change have ran the fan by its self and that seems to be ok. If I turn on the hot tap it stops for a bit At the moment I’ve got a cleaning solution going though the system.
A plumber suggested that it may be the diverter valve have stripped and cleaned that but its still there the only thing that did was to stop my problem that I had of my rads heating up when my hot tap was run.
Any suggesting on the boiler would be of great help

 

[Agile]

There are only two significant moving parts, the pump and the fan.

You should be able to determine which by "listening" with a mechanical stethoscope, a simple form of which is a thin stick!

Tony

 

[fordy52]

Tony
Thanks for the advice but I can still not determine if it’s the fan,(new fan £136 +vat) the noise seems to come from the top half of the burner hood and transferred to the fan and surrounding area. I am wondering now if it’s the main heat exchanger above the burners