noisy pump then no water

[Patho]

Hi all,

The saga of my house continues:

the pump for the CH and HW is now making a tremendous noise, it sounds like the impellor is catching, I know that the system needs flushing as there is black water in the radiators (I have some sentinel 400) but I cannot do this until I have finished the decorating as all the valves need to be open and according to the directions on bottle it could take upto 4 weeks.

the pump is a grundfos selectric 15-50
the house is a 3 bed semi
there are 7 single radiators

anything I can do to stop the impellor noise which is intermittent?

Last night I ran a bath and I like deep baths and just as the water reached reached the level of the overflow (nice deep soak) the Hot water stopped quickly followed by the cold . I flushed the toilet as this is mains fed and it refilled as quick as ever so the problem I assume is from the tank end!!!! I'm baffled as to why both would stop, is this related to the pump???

 

[kevplumb]

change the pump

the ballvalve is not opening enough in the header tank

 

[Patho]

Thanks Kev,

I'll have a look at Ball Valve tonight.

I had a look at new pumps last night in Bodgit & Quick but the power seemed to be on LHS given directional flow arrow ( which I assume should point from boiler towards tank) there is no room for a LH mounted power unit on mine is there anything I can do?

 

[kevplumb]

usually unde the hex screws ans turn the pump head

it's usually in the fitting instructions