Why is my pumped shower suddenly slow in starting?

[diybob]

Not been on here for ages, got a lot of help when I installed my bathroom some years ago. Everything went fine until I had to replace the shower mixer valve recently. The old one had started to get stiff to turn, so I fitted an identical unit to make the job easy - it's a cheap, minimalist "Harrison Mode" unit from a well known victorian supplier. All went well, until I came back from 2 weeks away, and I now find there is a delay when I turn the shower on - was a second or two, now up to 5 seconds before the pump starts and the water starts to flow. It's fed from a low-level H&C pump and has worked fine for over 10 years. Any ideas?

 

[Lou]

Hi there

Have you sorted out your issue? If not, have you got any photos of the shower?

 

[diybob]

Thanks for asking Lou. After taking 30+ seconds to kick in every morning, it seems to have cured itself over the last few days. It's a Stuart Turner - I thought it might be a blocked filter, but when I checked it doesn't have one. I wonder whether the flow switch was clogged and it has cleared itself. Fingers crossed. (We had a water supply interruption a few weeks ago, and the water was very dirty when it came back on. I have a pressure equalising valve for the bath H&C, and that is acting up too.)