Hi I’ve a gledhill 120 litre gledhill unvented hot water cylinder just installed when I turn my hot water on at the time clock and when it heats up the return pipe on the coil is making an awful humming noise what would be cause this?
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Gledhill indirect hot water cylinder
- Thread starter kmag123
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Could be the motorised valve. If it’s just been installed maybe get the installer back?
