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Its a sunvic dm. The actuator is white but the valve looks brass??

I think we have sorted it. It seems to be related to the 3 way valve which is also not working properly. We have moved this with a spanner and bobs your uncle we have heat. We are just not sure about whether we need to replace the whole 3 way valve or the actuator or what???

We live in a ground floor flat and it is oh so cold. Our basement radiators are competely cold. The radiators on the ground floor furthest away from our boiler are only warm. The ones near the boiler to get hot. The plumber flushed the system through twice using a non acidic solution...

A plumber flushed the radiator with non acidic solution on two separate occassions (apparently there was alot of brown stuff coming out so he thought the pipes may be slightly coroded and so he used non acidic as opposed to acidic). On the second occassion the solution was left in the system for...

Our radiators are cold downstairs (in basement) and the ones upstairs are hot nearest to the boiler and get cooler the further away they are. We have had the system drained and flushed but this has not improved the situation. Do you have any ideas as to what needs doing? Thanks ever so...