New shower flow rate intermittent

Just fitted new shower. Turn it on and flow rate is slow and water Luke warm. After a few minutes or playing about with temp dial the flow will increase and water gets real hot. Leave it at that setting and turn it off. When turn back on the flow rate is reduced again. Also they is a slight humming noise from the unit. Any ideas or is this a faulty unit cause it's brand new?
Asked 7 years ago by Steven
It sounds like it may not have been set up correctly.

The cog on the heating tank needs to be turned fully clockwise before fitting the front cover.

Answered 7 years ago by Barrie Seabright

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