sydnsue
Full Member
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- 260
We have an Alde system. When the boiler starts, there is a loud rumbling vibration coming from the boiler, enough to vibrate the exhaust hose. It sounds like a noisy pump or motor but the radiator pump is separate. After it has warmed up, the noise reduces but still quite loud. Any ideas what the problem is? Can't do much atm as we are high in the Alps.