Flate Plate Heat Exchanger for Gas combi boiler

square_bear

There are no fault codes showing.

We think that the problem seems to be noticeable not long after the central heating timer kicks in.

I am thinking that the boiler is trying to heat the radiators and the hot water at the same time and so the problem arises during this time.
If we have a shower after the central heating has been on for a while, a change of temperature in the water isn't so noticeable.

Would this be normal for a combi?

keystone

square_bear wrote: »

I am thinking that the boiler is trying to heat the radiators and the hot water at the same time and so the problem arises during this time.

A combi always gives priority to the DHW. So if CH is running and HW is called for it stops heating water for CH and gives it to DHW. It should not be able to do both at the same time unless the divertor valve is borked.

Cheers