Thermostatic Shower cold

[marco128]

Hi,

Recently noticed an issue with thermostatic shower that was determined to get sorted. The shower would drop (which got worse) and would not maintain temperature,due to water quality here and visible limescale in cartridges,decide to just replace entire shower for a nice new one.

This solved issue of leaking shower head,no more leaks,but the issue of the heat doesn't seem to be resolved.

I found that the shower will stay at right temperature,if you leave bath or sink tap on hot,but if you turn them off, the shower will run cold.

This led me to think it would be the water flow, so I got a measuring jug, turned shower to hottest setting and waited for 30 seconds to see how much was collected,and it equated to about 7.2l per minute from the shower head,similar from the main taps too.

That then lede to think could it be the flow sensor of the boiler and has that clogged with limescale because of water,but no idea where that would be on boiler haha

Boiler is an Ariston e-combi, not sure exactly how old, but everything is leading me to suspect that would be the issue but I could be completely wrong.

If anyone has any other help or suggestions would be massively appreciated 👍

Cheers

Marco

 

[Deleted member 120897]

Does the boiler fire up when the shower is being run? Could be a few things. Do you get hot water everywhere else?

 

[marco128]

Does the boiler fire up when the shower is being run? Could be a few things. Do you get hot water everywhere else?

That's the weird thing,boiler doesn't fire when showers run,but fires when the taps on and when you leave tap on shower temperature is fine. When you turn tap off, boiler stops and shower goes cold.

Everywhere in house gets hot water, that's only shower though so not got another to compare it with

 

[Deleted member 120897]

That's the weird thing,boiler doesn't fire when showers run,but fires when the taps on and when you leave tap on shower temperature is fine. When you turn tap off, boiler stops and shower goes cold.

Everywhere in house gets hot water, that's only shower though so not got another to compare it with

Isolate the cold feed under the boiler and either run a hot tap, eg bath or run the shower on hot, if you get water out that’s possibly your issue.

 

[fowlerboi]

Sounds like boiler flow switch. Had the exact symptoms before diagnosed as a flow switch and just changed the boiler as it was ancient anyway.