Poor hot water flow

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Poor hot water flow

Post  TheFunkeyGibbon on Thu Jan 26, 2017 1:32 am

I am trying to figure out which part is likely to be faulty and could do with some advice.

Symptoms:

  • Hot Water does get delivered but only for a few seconds, less if the flow is high, like the shower.


Tests:

  • The heat exchanger is getting warm but goes cool\cold quite quickly
  • The vent pipe is jacketed but if pull the foam back it isn't warm. Could this mean the tank is too cold?
  • Running the boost does not appear to help.
  • I never hear the pump come on when testing but I'm not sure if I should or not.
  • The header thank is as full as the float-valve will allow. It required a small top up but it was by no means empty.
  • The case is warm, not hot, to the touch to the left of both immersion elements.
  • The PCB LED blink pattern indicates the thermostats are both functional.


Based on the above can anybody suggest either a fault or further tests I could do? Please bear in mind I'm a consumer not a plumber or electrician.

Thanks.


TheFunkeyGibbon

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Re: Poor hot water flow

Post  TheFunkeyGibbon on Mon Jan 30, 2017 1:29 am

Ok so further diagnosis seems to suggest that the pump isn't running. I've seen suggestions that I should remove the large brass screw at the front on the pump to check that the impeller blades can spin freely as they may be sticking. Should I expect a lot of water to come out when I do this? I want to be prepared before I start!

Also the Led on the PCB started flashing to indicate a T2 sensor fault briefly before returning to the normal pattern. Could this indicate something else?

I am in the Milton Keynes area if anybody can recommend an experienced Pulsacoil engineer in this area it would be greatly appreciated. Thanks.

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Re: Poor hot water flow

Post  TheFunkeyGibbon on Mon Jan 30, 2017 5:31 pm

Ok I clearly have no idea what's going on and I'm not getting any replies. If I ever figure it out I'll let y'all know in the hope that it saves people grief in the future.

One thing I do know is these Pulsacoil are a huge pain in the arse and I curse the builders for installing one rather than a proper boiler!

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