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    Noisy unvented hot water cylinder

    Hi, I’ve recently had my external expansion vessel changed on my Telford Tempest stainless unvented cylinder as water was leaking out the PRV which showed up to be a split diaphragm on the old vessel. Now, the new vessel appears to be doing its job (no water leaking out the PRV anymore)...
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    Fernox DS-3 in combi boiler

    Is it safe to run Fernox DS-3 in my combi boiler? I’ve tried DS-40 but is didn’t cure the kettling/boiling water sound. :? Boiler is a Potterton Lynx 2. Cheers
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    Best way to use DS40

    I’ve currently got a Potterton Lynx 2 combi boiler that is making a right old racket (banging, hissing, groaning..)!! I believe this to be down to crud/scale in the primary heat exchanger. I’ve tried various methods of cleaning the system out (mains flushing, fernox boiler silencer, etc.)...
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    Potterton Lynx 2 - Overheating

    My Potterton Lynx 2 combi boiler is overheating. Basically, the CH will run fine for an hour or so but then after a while the boiler finds it difficult to switch its self off. If it does go off it seems to come straight back on again after a few seconds, then the radiators get unbelievably hot...
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