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Well, eventually got around to trying out running the boiler with the front panel off, and it does seem to be pointing towards the main heat exchanger as being the main culprit. When I tried it the temeperature was not up to the point where it is the noisiest, so I need to try again, but the...

I remember in the early stages of this boiler, when I installed it, that the person I spoke to at Ravenheat stated that I should have the flow to the boiler from the store at the *lowest* temperature possible in order that the condensing function of the boiler worked. Setting the boiler to 82...

..and I didn't mean lockshield valve. My mistake, they are actually gate valves. Andy

OK, tried boiler pump on setting 3, pretty much same effect as when going from 1 to 2, just reduces the noise a little, but certainly doesn't get rid of it. As expected, it dropped the temp. diff down to about 10 deg C. But boiler still noisy..... The 22mm lockshield valves are installed...

Tony: Problem only occurs when burner on, when pump is in overrun, there is no noise at all. As for using some sort of listening device, I thing this would be difficult as the whole (sealed) part of the boiler seems to be vibrating. Ideally I want to be inside this area, but I can't then fire...

I've used these manual air vents on a number of pipes, with good results. They only open when you want them to, so no unexpected leaks, or air entry. You can buy them from B&Q for a few quid, and they can then be soldered onto 22mm pipe. Don't take up much space either. Andy

Boiler is a condensing boiler, so ideally the temperature needs to be kept reasonably low, I aim for about 50, but then it's noisy, so 60 is better. Concerning the pump, it's been set on first setting, and second setting. I've then tried different gas/burner pressures at each setting, the...

Have a look at this link http://www.heatweb.com/systems/files/Specification%201605-5.htm It should answer some of the questions. I think you'll then see why anything to do with the central heating is irrelevant - the boiler only ever heats the water in the store, from which the central...

Oiled the fan last night, no change, unfortunately. Radiators all work fine but then I wouldn't expect them to be causing the problem. The thermal store feeds the central heating independantly of the boiler, boiler heats the store, radiators take heat from the store. Same with hot water...

Heatstore is just under 6 years old. Reason I don't think it is the pump is that after the boiler shutsdown the fan runs for a few minutes, and it's very quiet, no noise at all. The pump is next to the tank on the first floor, feeding the boiler on the ground floor. Andy

I'll give that another try as I'd already tried that and came up with nothing - virtually all of the housing seems to be vibrating, and 'cos you can't open it it's not possible to try it on individual components. However, nothing to be lost in checking the fan with the boiler shut down, maybe...

Hi, I've been looking in this forum for similar problems but can't find one so I'm posting this question. I've a Ravenheat CSI primary condensing boiler feeding a 180Ltr thermal store. Recently the boiler has started to vibrate at various stages whilst heating the water, sounds like...