New Power shower, pressure problem

[Martin24]

we just installed a new power shower, Mira event Xs Manuel. ( from an old Mira event,make unknown, that the pump wasn't kicking in anymore and was creating a stangant water smell) and it's worked fine for about a week now when we turn it on the pressure is dredfull and pump sounds like it's working overtime for it. after a few minutes the pressure sorts it'self out tho and the pump sounds healthy again. we have hot and cold comming from it at start. any ideas what i should do to this?

bare in mind i'm a tottal noob with plumbing.

we have a hot water tank in the airing cuboard and a cold in the loft.

 

[seco services]

poor pressure/pump going high pitch points to water starvation or airlocked.
check the filters are clean
and water is running freely from both filter holes.

 

[Martin24]

Ok I'm going to attempt to follow the instructions in the instaltion book, it's a bit beyond me tbh, would the filters be "clogged"? On a new shower? How do I fix an airlock?

Summary
Pressure is very low, then picks up after ~60secs. Pump makes high pitched noise, quietens a bit when pressure increases. Pressure still seems lower than it should be. It also has a couple of tines continued to flow after turning off the shower switch and flow control.

 

[seco services]

would the filters be "clogged"? On a new shower?

quite common is the waters been isolated then turning on can drag scale/crud up to the filters thats why they should be flushed.

How do I fix an airlock?

could be a plumbing issue.
clean the filters and while they are out let each supply run and clear any air.

Summary
Pressure is very low, then picks up after ~60secs. Pump makes high pitched noise, quietens a bit when pressure increases.

thats right the pump will be noisier with no water running through it.

It also has a couple of tines continued to flow after turning off the shower switch and flow control.

has motor stopped when flow continues ?

 

[Martin24]

Thanks for the breakdown. Will try what you suggested, yes it flows hot and cold after motor stops