24 greenstar fault

[hammers4spanner]

got a fault on a worcester comber greenstar hot water works fine but when switched to heating after about 5 mins the boiler begins to make a slight whineing noise then cuts out .
This happens on heating only and boiler cuts out not long after the whineing starts and needs to be reset

any ideas before i pop along today

 

[gassafe]

Co2 levels on max & min, gas inlet pressure...?

 

[shaky]

Co2 levels on max & min, gas inlet pressure...?

I agree stick your analyzer in and check your co2

 

[arran197]

Ye, definitely check the adjustment on the gas valve with this. It'll be the minimum which will stop the noise.