Mira 415 Shower - Temperature Drifting

[LiamD]

I have a 3-4 year old Mira 415 mixer shower, which is fed from my combi boiler. The temperature is not staying constant and drifts from being too cold t being too hot. Can anyone help as to what I woudl have to change to fix it.

Thanks,
Liam

 

[seco services]

have you checked that the boiler is not cutting in/out ?

 

[LiamD]

No I've not checked the boiler. I assume just check the combi power light?

 

[seco services]

no run the shower and check it keeps firing up on dhw.