Hot water cuts off if tap is on more than half open

[thosas]

Hello, I have a Range PowerMax 155x (potterton / baxi I cant figure out who makes it!) that is almost 4 years old now, lately we have had a problem where opening the taps more than half way causes the hot water to cut off all together, no water comes out of the tap at all!

This feels like a pressure issue to me and a while back we had leaky radiators, any possible link?

Anyway, does anybody have a clue as to what the problem may be? I have also had the covers off and cannot find a pressure gague that tells me the boiler pressure, but others have mentioned knowing the pressure, any help would be much appreciated.

thanks

 

[a jeffries]

if the preassure has dropped since you have been living it sounds like either the flow regulator or heat exchanger is blocked, this is not linked to your radiators

 

[thosas]

hmm, thanks. I got "Heat Team" to come and look at it for a fixed price, they are going to change loads of parts in the boiler though I dont think the engineer really knew what to do with it.

trouble is I think the engineers are on a bonus for how many they can fix in a day as he ran out of here within half an hour on-site, then booked to come back and do the job, though he has since cancelled that appointment too. I think its going to take him 3 hours to do and he wants a bigger xmas bonus.