New Thermostatic Shower Valve Not Working - No flow

O

Os11art

Member
Just had a new thermostatic gravity fed shower installed.
We are struggling to get any flow from the main shower head.
We have a 2.0Bar showermate pump installed also.

Its a 3-way valve with a diverter, so 3 controls:
1. Main shower on/off
2. Temperature control
3. Divertor to hand shower/body jets/off

We always get flow from the divertor hand shower head but not the main rainfall shower.

Anyone have any ideas?

thanks
 

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Probably not enough flow to activate the pump from the rainfall.
If you lift the handheld above the rainfall and turn on the shower does it still work?
 
Mike83 said:
Probably not enough flow to activate the pump from the rainfall.
If you lift the handheld above the rainfall and turn on the shower does it still work?
Click to expand...
Just lifted the handheld above the rainfall and the handheld still worked.
 
Try running the handheld as normal then as fast as you can divert to the rainfall.
Hopefully the pump doesn’t turn off.
Does it then work?
 
Mike83 said:
Do you get any flow at all from the rainfall?
Click to expand...
Yeah we get flow once the handheld has been operated then we switch to operating the rainfall lever and it kicks in.
Sometimes the rainfall works but mostly when turning the lever it doesn’t.
 
Os11art said:
Yeah we get flow once the handheld has been operated then we switch to operating the rainfall lever and it kicks in.
Sometimes the rainfall works but mostly when turning the lever it doesn’t.
Click to expand...
Do you mean after the hand held triggers the pump ,the rain head SOMETIMES still doesn't give water while the pump is still running ?
 
Os11art said:
No sorry once the handheld has activated the pump the rainfall will always kick in and work
Click to expand...
Ok ,fine. It's a flow issue ,or rather a lack of it to trigger the pump due to low gravity pressure.
Wasn't a negative head pump installed ???
You should take issue with the installers.
 
terrymac said:
Ok ,fine. It's a flow issue ,or rather a lack of it to trigger the pump due to low gravity pressure.
Wasn't a negative head pump installed ???
You should take issue with the installers.
Click to expand...
I believe it’s a positive head like attached, same model.
 

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You probably have a slight head of water but it’s just not enough to trigger the pump.
Negative head pump should solve it.
 
The rainfall seems to work when the temperature is set to cold. Our cold supply pressure is a lot greater than the hot. would this confirm it’s a supply pressure issue?
 
The pressures should be similar. Perhaps the cold is mains - should be from your CWST with a dedicated feed.

Try turning your main stop tap off and retry the shower on cold. If it doesn’t run, it’s been incorrectly plumbed.
 
dcox said:
The pressures should be similar. Perhaps the cold is mains - should be from your CWST with a dedicated feed.

Try turning your main stop tap off and retry the shower on cold. If it doesn’t run, it’s been incorrectly plumbed.
Click to expand...
Yeah it has a dedicated feed from the cold water tank.
 
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