Aqualisa very hot water low pressure

[Timmy_28]

Hi All, this is my first post and need help. I recently developed a fault with my Aqualisa Quartz electric shower 8.5kw. When you start the shower the pressure is really low and you can hear the water heating up. However the water is extremely hot and the pressure is really low. It then makes a little pop noise and goes cold. This happens continuously. I managed to get another Aqualisa the same model from a friend, I installed the shower and worked fine for 2 days, low behold the next day the same problem occurred!!! Any help would be appreciated.

 

[Welder]

Sounds like a low flow issue. By that I mean you are getting an inadequate cold water flow through it causing it to 'kettle'.

 

[Burger]

Check your head and hose, undo and run shower without them trying each one in turn. If it works well without either of these, then you have found your fault. Failing that, sounds like something else is causing the thermal cut out to operate, could be low pressure as per @YorkshireDave.

 

[Harvest Fields]

Are you in a hard water area?

 

[Timmy_28]

Sounds like a low flow issue. By that I mean you are getting an inadequate cold water flow through it causing it to 'kettle'.

Never thought about the pressure as we've always had good flow. However after running the taps this evening flow doesn't seem normal. Any tips on low pressure?

 

[Timmy_28]

Check your head and hose, undo and run shower without them trying each one in turn. If it works well without either of these, then you have found your fault. Failing that, sounds like something else is causing the thermal cut out to operate, could be low pressure as per @YorkshireDave.

The hose and head are brand new as per @YorkshireDave it seems like the pressure?

 

[Harvest Fields]

Random questions. Is the stop tap fully open? Do you have a combi or unvented cylinder?

 

[Dan9866]

Never thought about the pressure as we've always had good flow. However after running the taps this evening flow doesn't seem normal. Any tips on low pressure?

To increase your pressure you can fit a cold water booster but first try and change your incoming main stop tap because if they are old they can scale up and the diameter inside will tighten causing loss of pressure

 

[Welder]

To increase your pressure you can fit a cold water booster but first try and change your incoming main stop tap because if they are old they can scale up and the diameter inside will tighten causing loss of pressure

Personally, I'd be looking at what had changed recently first. Go through logically testing FLOWS (pressure x bore) all over the house.

My instinct (FWIW) is that its something simple (in the great scheme of things).