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I have a powermax 155 sealed system which is about 7 years old. As of 1 week ago it makes a noise like a washing machine with water slooshing around inside it when it is running. It will try to light a few times then goes to "lock out". No matter how many times I try to get it to run it will...

I have a Powermax 355 boiler with built in timer. Every morning it starts up to heat water and central heating. After just a few minutes it starts making a loud whistling noise. This noise lasts for about 20 - 25 mins when it gradually fades away then stops - although the boiler remains on as...