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New thermostatic bar mixer temperature fluctuation ?

Eyup everybody, after fitting a new thermostatic bar mixer I find that the temperature fluctuates a lot, not sure if re`calibrating will cure it or is it something else, the shower is situated only about 5 ft from the combi boiler if that makes any difference I don`t know, Thanks in advance if any of you guys can help me with this one, Regards.
Regards., September 2015
Run the shower and check temps at the same time check the hot output from the boiler if the boiler temp is fluctuating from very hot to cold it may be the shower is not set up for enough water flow there is some times graded washers that are fitted in the inlet side to adjust for different pressures/flows etc

toptrish, September 2015
Hiya, yes it`s a standard thermostatic bar shower if there is such a thing, and the hot is on the left as it should be as is the pipework, thank`s.

Regards, September 2015
Is the mixer designed for combi boilers or have you got the hot and cold inputs orientated correctly,not all shower mixers are the same

toptrish, September 2015