1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Desparatly need advice with ongoing problems with RD532 combi boiler

Discussion in 'Plumbing and Central Heating' started by Buzzc150, 19 Sep 2019.

  1. Buzzc150

    Buzzc150

    Joined:
    16 Aug 2019
    Messages:
    5
    Thanks Received:
    0
    Country:
    United Kingdom
    Hi

    I've been having issues for some months with our RD532 boiler. 2 different engineers have been unsuccessful in diagnosing the fault.
    Here's what happens. When a hot tap is turned on the boiler fires up but very quickly over heats. The temperature gauge on the front the shoots straight up to 99 in the space of a few seconds (the temp selector on hot water dial is set at minimum). When you take the cover off you can see steam and bubbling escaping from the boiler core. The boiler will then shut itself off. The hot water will stay in the boiler for a few minutes and then with a bit of banging the hot water gets released into the radiators.
    However this doesn't happen every singe time. It's all a bit random. Generally, once it over heats, I'll leave it for a few mins then try and again and 7/10 times it will give me steady hot water.
    The first engineer to visit changed the diverter valve but this didn't help. The next one put a new heat exchanger on which also hasn't helped.
    There must be a way to diagnose the fault without randomly changing parts until something works. The first guy wanted to try changing the electronics/mother board but wasn't sure if that's where the fault is...and at £400+ I don't want to try it unless it's going to work.
    Any ideas please ? I could post a video of it if that helps.
    Many thanks.
     
  2. Sponsored Links
  3. Gasguru

    Gasguru

    Joined:
    9 Sep 2005
    Messages:
    11,744
    Thanks Received:
    3,070
    Location:
    Sussex
    Country:
    United Kingdom
    Did they check the pump was running? That would be the most likely culprit...
     
  4. ollski

    ollski

    Joined:
    8 Oct 2003
    Messages:
    6,685
    Thanks Received:
    432
    Location:
    Bristol
    Country:
    United Kingdom
    Agree, bet its one of those awful modularing pump heads
     
  5. dilalio

    dilalio

    Joined:
    20 Mar 2009
    Messages:
    6,971
    Thanks Received:
    1,048
    Location:
    Potters Bar
    Country:
    United Kingdom
    What does it do in CH mode?
     
  6. Gasguru

    Gasguru

    Joined:
    9 Sep 2005
    Messages:
    11,744
    Thanks Received:
    3,070
    Location:
    Sussex
    Country:
    United Kingdom
    It looks like a standard Grundfos 5m so a cheap repair.
     
  7. Sponsored Links
  8. Madrab

    Madrab

    Joined:
    4 Oct 2012
    Messages:
    7,489
    Thanks Received:
    2,074
    Location:
    East Renfrewshire
    Country:
    United Kingdom
    There is, you need to get an engineer in who is familiar with fault diagnostics and not just guessers that will chuck parts at it.

    Depending on what is found it may be worthwhile talking to Worcester and asking them about a fixed price repair.
     
  9. Buzzc150

    Buzzc150

    Joined:
    16 Aug 2019
    Messages:
    5
    Thanks Received:
    0
    Country:
    United Kingdom
    Thanks for the responses. It works just fine in CH.
     
  10. Gasguru

    Gasguru

    Joined:
    9 Sep 2005
    Messages:
    11,744
    Thanks Received:
    3,070
    Location:
    Sussex
    Country:
    United Kingdom
    Yes but does it have sufficient performance to operate in DHW mode which places a much higher demand on it, and by the sound of the fault the pump could be sticking.
     
  11. ianmcd

    ianmcd

    Joined:
    15 Aug 2010
    Messages:
    19,646
    Thanks Received:
    7,652
    Location:
    Lanarkshire
    Country:
    United Kingdom
    Call Worcester for a fixed price repair and you will get a warranty with it
     
  12. ollski

    ollski

    Joined:
    8 Oct 2003
    Messages:
    6,685
    Thanks Received:
    432
    Location:
    Bristol
    Country:
    United Kingdom
    Is it definitely the old rd532 or the newer 532i?, if the pump has 2 purple wires in addition to the 3 core feed then id definitely start there.
     
  13. DIYnot Local

    DIYnot Local

    Joined:
    3 Sep 2019
    Country:
    United Kingdom

    If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

    Select the supplier or trade you require, enter your location to begin your search.


    Are you a trade or supplier? You can create your listing free at DIYnot Local

     
Loading...

Share This Page