worcester bosch greenstar 30cdi gurgling when on water only

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3 Sep 2010
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Location
Cambridgeshire
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United Kingdom
hi

i very recently had my old boiler replaced with a worcester bosch 30cdi - we didnt order a system boiler (pressurised) but that was what was installed. the old water cylinder remained as it was absolutely fine

ever since it was installed it gurgles very very loudly whenever it is on water heat only, the plumber came back, bleed the air but to no avail

now he wont even return calls and we have no idea what is causing the problem and if it a safety issue (it works fine when on central heating or central heating and hot water)

any advice would be gratefully received :D
 
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Is there a balancing valve on the hot water circuit, that is adjusted too far to the closed position.
 

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