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Baxi Megaflo Boiler - 'crackling' noise & heat loss

Postby hastings » Wed Aug 04, 2010 11:25 am

I have recently had a Baxi Megaflo boiler fitted. After a lot of effort the radiators were balanced and appeared to work okay although there was a bit of ‘crackling’ noise from the boiler (this was particularly bad when the hot water was switched on) and was believed to be air in the system which I was told should be expelled in time through the automatic vents.

Obviously during the warm spell the heating was very rarely used and now I have come to need the heating again I have noticed that there are a few problems. To begin with the ’crackling’ noise is a lot louder/heavier and now happens when the central heating is on as well as the hot water.

I have had a Baxi technician out to have look at this as I believe through desperation my fitter thought that the boiler itself may have been faulty. The technician diagnosed the problem as being not air but a resistance to flow in the return pipe. He indicated that this could be a very big job in trying to locate and resolve the problem. After 6 months of renovation we couldn’t face more upheaval.

The second point is that the top floor radiators of my three story house do not get any heat to them at all now. All of the other radiators around the home heat up quite well initially and then after a hour or so several of them cool off completely.

Does anyone have any ideas as to how I can maintain heat to all the radiators and hopefully to reduce the ’crackling’ noise around the pipes near the boiler.

I don’t want to call the fitter out again as I have lost all faith in his ability and can’t take any more of his excuses.
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Simply Build It

Postby eggers » Mon Aug 09, 2010 7:57 pm

without sounding patronising, the radiators upstairs don't need bleeding, do they? Are they fitted with thermostatic radiator valves?
the crackling noises could be air, or sludge in the system, but i do recall some of the baxi heat exchangers did have manufacture problems, but i think that has been sorted now. Without seeing it myself it can be hard to diagnosis
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