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Hi all, We had someone out to our Oso direct unvented cylinder recently as it was dripping tepid water from tundish when running. He recharged the internal air gap and all was well for a few weeks, but then the same problem reoccurred - tepid drip when heating element running, although the...

Hi there, Recently had engineer out to our 11 year old Oso direct immersion water heater as it was slow dripping through tundish. He drained and refilled/reinstated internal air gap and no dripping now, however, when turned on it immediately starts making a slight whistling/squeal type noise...