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Discuss Eco Tec plus 937 Overheating in the Central Heating Forum area at UKPlumbersForums.co.uk.

  1. Antoaneta Rogerson

    Antoaneta Rogerson New Member

    Hi, this is my first post and am hoping someone can help me with a problem I've got.
    I've got a Vaillant Ecotec 937 with the storage pack its 6 years old and has been fine up till now. I am not getting no hot water at all, the boiler fires up when I open the hot tap and the plate heat exchanger gets red hot the boiler temp reaches 80 odd degrees and cuts out. The engineer removed the plate heat exchanger and descaled it, it was fairly clean and nothing to stop it from working. He put it back and still no hot water, I have checked the diverter valve actuator and it is working in heating and hot water and He take it the valve it's self is working as the plate is getting red hot. I've turned off warm start and it makes no difference, am I right in thinking it could be the dreaded issue to do with the storage pump . Does this pump run even with warm start off?? I've looked in the book and the diagram looks as though it needs to run to be able to get a flow through the plate. The engineer changed the mane PCB but still the same problem
    He thinks is the APC pump and booked the appointment for two Enginners to come..
    I'm really stressed. Really need an advice.

    Any feedback would be greatly appreciated!! Thanks
     
  2. rpm

    rpm Trusted Plumber Top Contributor!!

    Don`t pay for the PCB if it didn`t help!
     
  3. ShaunCorbs

    ShaunCorbs Trusted Plumber GSR Top Contributor!!

    have you tried phoning vaillant up im sure they do a fixed price repair

    also hop you dont mind me asking where in the uk are you?
     
  4. Antoaneta Rogerson

    Antoaneta Rogerson New Member

    Thank you for your reply.
    the engineer changed the PCB bored is from Vaillant
    I'm in Langley SL3 7RB
     
  5. ShaunCorbs

    ShaunCorbs Trusted Plumber GSR Top Contributor!!

  6. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    Afternoon. You said that YOU checked the diverter. You have to take the case off to do this. Are you gas safe registered?
     
  7. Antoaneta Rogerson

    Antoaneta Rogerson New Member

    Sorry he did ofcorce
     
  8. Chalked

    Chalked Plumber GSR

    Are you sure it's direct through vaillant? As there fixed price repair is a one off cost and they will keep coming back until it's fixed
     
    • Agree Agree x 4
  9. jtsplumbing

    jtsplumbing Plumber GSR Top Contributor!!

    Cant understand why he put in a new PCB without checking if the pump is working that is basic stuff where did this guy come from ? he doesn't seem to know anything about boilers ! is he GS or just a plumber ? I would be asking for a refund for the board.
     
    • Agree Agree x 1
  10. GH77

    GH77 GSR Top Contributor!!

    I would turn on the heating, the boiler should fire and run on low rate for a few minutes, then as the system is cold it will ramp up to full rate, if it over heats/ bangs and crashes then shuts off, and after the pump over run lights up and repeats then i'd say you have a fouled primary heat exchanger, ecotec's are prone to it if fitted to a dirty system that hasn't been powerflushed and a primary filter fitted, if that is the case I would cut your loses and get a reputable accredited installer to fit a new boiler with a 10 year warranty. IMO
     
  11. RoryD

    RoryD Plumber GSR

    The flow and return pipes inside may be the old type which have rubber sections midway down them(likely they are). They'll be blocked. Engineer should squeeze them firmly and crunching will be felt.Thats the sludge breaking up. Replacements required.
     
    • Like Like x 1
  12. jtsplumbing

    jtsplumbing Plumber GSR Top Contributor!!

    Think they have been upgraded to copper pipes now !
     
    • Like Like x 1
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