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200thhorseman

Evening all,
I have recently been having some trouble with my Baxi Solo 2 50 PF boiler. I have cover for it through Scottish Power and eventually after numerous visits by their engineers and a new fan, PCB, pressure switch and gas valve the problem was solved.

The boiler is now working well except for one odd issue. Approximately 5 mins after the boiler switches off (i.e. after the timer has switched it off) it suddenly makes quite a loud chuffing noise. It just doesn't chuff continuously, it only does it the once - 'chuff'. To me it sounds like a sudden release of pressure, maybe air. I cannot smell any gas so I am assuming it is not that.

The noise is similar to when the main gas burner ignites, but is quite a bit louder (we can hear it from upstairs). I wondered if it might be that the new gas valve was faulty and wasn't closing properly allowing the flame to continue burning until eventually it extinguishes with a pop, however I cannot see any flames through the little window when the burner has switched off.

Could it be that as the boiler cools down there is a faulty gasket or something that is allowing air to pass somewhere (releasing a vacuum or something)?

Any ideas would be appreciated. I could phone Scottish Power yet again however I think this issue would be difficult to diagnose because it would be difficult to replicate when the engineer is here.

Best regards,

Rob
 
could be the pump spinning briefly to disperse heat in boiler and auto air going off.
 
Hi there,

The pump overruns by about 8 mins to dispel the heat in the boiler. There's usually a click from the PCB (I'm guessing a relay or something) and the pump turns off.

What do you mean by auto air?

Thanks for your response by the way.

Rob
 
Automatic air vent releases air in system. Wouldnt say it sounds like chuffing but it does make some noise. More like pssss,pssss LOL

Just re-read your post, ,,,, dont think you have aav on boiler

Could it be heat exchanger cooling down and leaking. Thats more like a chuff
 
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