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Yeah, sure. It still needs "checking" but that's better than needing "fixing"

There's a variable thermostat that runs the hot water temperature on the left behind the top panel. I took it out and tested it in a pan of water, it worked OK but was set for too hot, IMO. It was set to 3 O'clock so I've turned it down to 12 O'clock and the boiler cuts out sooner. Out water...

:arrow: here's an mp3 of the whistling noise, if it might help. You can hear it stop abruptly when the boiler switches off. 8)

6 services? :oops: I don't think it's even had one. Maybe it's time. Do most people have there boilers serviced regularly or is it more of a "should do" kind of thing that rarely gets a look in? How much would you expect a boiler service to cost? (roughly)

I don't have a header tank either, come to think of it, it feeds straight from the mains. There is a big tank of hot water inside the boiler but no header tank (in the loft) as such. I had my head in the airing cupboard yesterday while it was whistling, trying to pinpoint the source of the...

I thought it was coming from that, it's not easy to tell without climbing on top of it. The pressure is about right; 1 when it's off, 1 to 2 when it's on. It seems to be hot enough we've plenty of hot water and the radiators are blazing. How would I check if it was "running dry"?

I've got a Range Powermax 155x (yes, yes they're sh*t..) Anyway, it's about 7 years old and lately it's started making a fairly loud whistle when it's really cooking. I took it apart to have a look, as you do... ...to see where the noise was coming from and it seems to be this brass...