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Worcester Highflow 400 RSF intermittent DHW

Discussion in 'Plumbing and Central Heating' started by ktnabd, 19 Sep 2018.

  1. ktnabd

    ktnabd

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    OK another observation, CH cutting and radiator are luke warm.. and seems supply to radiator is super hot but return from the radiator is cold.. that means return within boiler is somewhere blocked!
     
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  3. boilerdoktor

    boilerdoktor

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    Probs blocked the Nrv in the return bulk head
     
    Last edited: 7 Dec 2018
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  4. ktnabd

    ktnabd

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    ok... looks guys changed the dirverter valve never removed the air from the system!!
    - and I removed some of the air the same night (had to do couple of time as presume air/water is all dissolved due to CH running and needed to wait when boiler hasn't been started and allows air to trap in a radiators- been freezing past few days).. so presto! as soon as got rid of air, CH started again .. :confused: could that be making CH cutout?

    Well.. CH is working again (thank god!), but DHW has the same problem (on DHW demand - CH supply gets quite warm! so all heat is being discharged in CH)

    HE is not in stock means going to be next week by the time heating eng replaces it! - hope this fixes the issue before something new appears!
     
  5. ktnabd

    ktnabd

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    sorry just been following this ! and realise never answered. its 400 electronic.
     
  6. ktnabd

    ktnabd

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    thanks @boilerdoktor, still worth a check for NRV, if CH back to working mode? - can ask SSE guy to have a check.
     
  7. boilerdoktor

    boilerdoktor

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    have you cleaned the filter in the top manifold?
     
  8. ktnabd

    ktnabd

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    No haven’t opened or checked anything since guy replaced diverter valve. So no havent cleaned the filter, will wait till SSE comes to replace HE and ask him to check filter too.
     
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