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Hot Water Suddenly Stopped Working While Showering

Postby KennJB » Thu Oct 20, 2016 11:22 am

Good morning, I moved into my current home 7 years ago and the Dura speed 70 was already installed and feeds two showers and it has worked beautifully until now. 4 years ago I had a new Grant boiler installed. The plumber recommended changing the gravity fed system to pressurised and all has worked well. The radiators were flushed and a filter system installed to collect any crap. I hope the photos help but briefly, I was showering when the water suddenly went cold? I checked the shower pump and the cold side worked fine as the pump ran when the mixer was turned towards the cold, but if I turned the mixer to the hot side the pump did not work? The Deleted flanged is positioned at top of HWT, which I assume is correct as the plumber changed the HWT when he carried out the work. I believe one photo shows there is a air pressure relief valve going into the top of the CWT (Not sure I have described correctly)... But I am worried that the HWT may have a build-up of air?

The heating system is working well but I have noticed the hot water tap in the kitchen has lost pressure these past 6 months or so?

My questions are: 
1. Can one side of the pump fail or is the problem that not enough water is running through the pump?
2. Is the top of HWT full of air, causing pressure problems/water flowing to the pump?
3. Is the pressure drop on the hot water tap in the kitchen also caused by air in the HWT?

I am thinking about striping the pump down to see whether the impeller is sticking or the inlet filter is blocked?

Any advice would be much appreciated.... I have just retired and things are a little tight. I am practical minded and not phased by tackling small jobs. I have tried a few plumbers locally but they all seem too busy at the moment?
This I think is where the air should be escaping to from the top of the HWT
Hot water feed is coming from the pipe with the gate valve on the left of photo. There is an Isolation valve below this to isolate hot water to pump. On the right can be seen the grey plastic cold water inlet pipe coming from the CWT.
Deleted flange on top and hot water feed comes off leading to gate valve and beyond. Hot water air relief valve continues up towards CWT.
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