Vokera Compact 24 DHW low pressure

[phil77*]

I've got a 2 year old Vokera Compact 24 Combi boiler which has developed a fault in that the domestic hot water supply is running very slowly, I checked the flow on the cold inlet pipe that goes into the heat exchage unit and it's fine, the little plastic filter is clear so there is no loss of flow rate going in, but it's really slow coming out of the taps. Also it sounds as if there is air trapped in the pipes but I turned off the cold water at the mains and opened the hot taps to release the air, then turned the cold back on, but still hot water is very slow.
Does anyone have any ideas??

 

[nickso]

remove the little black o-ring from the flow regulator on the rear most pipe of the heatexchanger. if that doesnt give enough flow then then remove the flow reg entirely....be aware that removing it completely sometimes makes it difficult to seal the fibre washer against the heat exchenger

 

[phil77*]

Thanks Nickso, I'll give that a try in the morning and let you know how I get on.

 

[phil77*]

Did what you said Nickso and it's absolutely brilliant now,thanks very much for your help. Only one question, why did Vokera put the O ring there in the first place??

 

[nickso]

it was there to regulate the flow to the taps to 10 litres a minute or whatever that boiler does. this model seems to have a particular problem after a few years and it kills the flow....ive never found out why.

you might find that some of your taps run very fast now and if they are on full the water isnt very hot....you will just need to throttle the flow back yourself at the tap, or if your boiler has the black tap handle underneath the boiler on the right side you can turn that up or down to set up all the taps as desired. at least now you will be able to get the maximum flow should you wish it.

 

[phil77*]

Thanks Nickso I'll bear that in mind if the water isn't hot enough, though when I tried it this morning it was plenty hot enough. Once again thanks for your help