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I have a multifuel stove which runs my central heating system from its back boiler. When it gets really hot there is a loud clicking and knocking sound from the rear of the stove where the thermostatic control is. The noise stops when I turn the electric pump off. How do I fix this please?

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That clicking and knocking noise you hear is called cavitation. It's when the bubbles of steam are cooled down rapidly and implode upon themselves. Cavitation is not a good thing to have in a boiler as it can cause dramas. This cavitation is more than likely because the boiler is firing too hot. A service technician should be called to turn the regulator down a little bit.

Posted on Sep 18, 2008

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