shower mixer pump problems.... i think?

[jaycshetland]

Hi. I have a mixer shower with a pump on in the airing cupboard. The old pump packed in and we replaced it with a new one not identicle but close. Now we can't get the shower to mix to a nice temp. It's either nuclear or subzero no inbetween!! Can any one help?

 

[Phil]

More info needed, make and model of old and new pumps, also picture if you can upload?

 

[PlumbBobBob]

i would think it is the mixer itself which is not working correctly. maybe the thermostatic cartridge has failed. as phil said more info needed and pics.

 

[secret squirrel]

cartridge in the shower,

If its a standard bar mixer just replace the whole unit, there as cheap as chips!