hot radiators but no hot water. HW trickles out cold

Boiler type:-
Worcester Bosh Thermotechnik 28CDI RSF
GAS

This boiler heats the rads and used to supplies hot water to the taps on demand.


I have a power shower (pumped) which is fed from a cold tank in the loft and a cylinder sat next to the combi. (This used to be electrically heated but recently added it to the combi- see previous posting) (The tank is only for the shower, the rest of the house uses the combi for its HW)

Over the last few days I have noticed lower water pressure in both hot and cold taps. Last night the hot was very low but still usable but this morning the cold is fine but the hot trickles out and is cold.

Any ideas?

Thanx in advance for any help.

sorry i got lost trickles out of the shower or the taps

Hi,

Yes sorry, the water trickles from the hot water tap.
The shower is independent of the combi system (it uses water from header tank in loft & from hot cylinder (heated via combi))
I hope that makes sense... Now I’m getting lost.
Combi used for heating rads & HW to taps only.
Combi also heats cylinder via mid pos valve (just added last week)
Power (pumped) shower uses water from header tank & hot cylinder.

Now I'm repeating my self

Thanx in advance for any help.