Baxi 105e Instant - Hot Water Problem

[uniseat]

I have a Baxi 105e Instant.
When I try to get hot water from the small sink taps or the shower, I get the small amount in the hot water tank in the boiler and then it runs cold. but when i run the larger bath taps it runs warm and it's fine.

Why is that?

 

[ChrisR]

Could be the water flow rate is too low, or the flow switch in the boler is lazy. What flow rate are you getting at the tap(s) in litres/minute?

 

[Baxmax]

D.H.W Differential,worn diaphram.