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Discuss Boiler keeps cutting out! in the Central Heating Forum area at UKPlumbersForums.co.uk.

  1. Daveafsmith

    Daveafsmith New Member

    Hi everyone. Basically I have an old ikon 40 50 ci boiler. It recently started cutting out after 10minutes of heat. I thought it may be the pump so that has been changed. Still hasn't stopped it though. When it fire up it heats up the rad closest to the boiler for about 7 mins but no others(apart from a few days ago where it heated all of them up for 5 mins). When it has cut out it wont fire back on until its cooled down. I am thinking maybe a blockage? Or an air lock. Any help greatly received.
     
  2. Vee

    Vee Plumber GSR

    Sounds like circulation issue. So yes could be blockage or airlock. Any signs of pumping over into header? Or is it sealed?
     
    • Agree Agree x 1
  3. Daveafsmith

    Daveafsmith New Member

    Hi mate and thanks for your reply. I have drained the system down this evening. Refilled with some inhibitor and let it refill. Still no joy. Excuse my ignorance but what does pumping over into the header mean? There is a retro fitted piece of pipe work that goes lower than the rest of the pipework which I have mains jetted out this evening as well and the water was filthy but that still hasn't sorted it out. It's an open vented system. I really don't want to buy a new boiler as I think this is a good one when it works. Not actually that much that can go wrong with it really
     
  4. Ric2013

    Ric2013 Plumber Top Contributor!!

    Pumping over means water is forced up the open vent which finishes over the top of the feed and expansion cistern (or header tank) and dribbles into this cistern.
    I don't follow.
     
  5. Daveafsmith

    Daveafsmith New Member

    No sign of that mate. Basically the guy who owned my house before me converted the garage in to a bedroom, installed a stupid fan thing that runs off the heating. The pipes for this are in the floor. So naturally the sediment will sit here. I blasted the pipes for this bit through this evening and still no joy. I have replaced the pump already so its either a circulation issue or the thermostat? Weirdly it's only the rad nearest the boiler that heats up before it stops.
     
  6. Ric2013

    Ric2013 Plumber Top Contributor!!

    You don't have a one-pipe system, by any chance? Could you previously turn off any one radiator without affecting the other radiators?
     
  7. Daveafsmith

    Daveafsmith New Member

    There is a flow and return at the boiler and there are a couple of loops which are dual piped... the boiler won't even turn on for ages now. I am debating the pcb....
     
  8. Vee

    Vee Plumber GSR

    What controls set up do you have, i.e valves etc? Could be stuck valve only partially opening?
     
  9. Daveafsmith

    Daveafsmith New Member

    It's the standard 15 year old 3 way valve with a slider on one side. Controlled by the main heating controls. The boiler fired today but same issues. I will look into replacing this though. It's up on the list.
     
  10. Daveafsmith

    Daveafsmith New Member

    So. I drained it all down again. And she. I filled it back up I seemed to get a lot .ore air out of this time. Fired it up and it does again. Am I over complicating This? Could it just be the thermo cut out? The pipes do seem got but very hard to judge.
     
  11. Gary80gas

    Gary80gas GSR

    what happens when you set it to just heat the hot water only?
     
  12. Daveafsmith

    Daveafsmith New Member

    Just waiting for it to fire up again once the temperature has come down
    Today I have removed and flushed all the down stairs rads. One was particularly nasty. The rest were not too bad. Is it worth doing all the upstairs ones as well? Figured all the cheap would sit at the bottom.
     
  13. Ric2013

    Ric2013 Plumber Top Contributor!!

    It's what we used to do before someone realised there was money in selling us all powerflush machines. May not be quite as effective as a powerflush, but if you're happy to do it, do it.
     
    • Agree Agree x 1
  14. Daveafsmith

    Daveafsmith New Member

    It fired up. The rads got hot????? Then it died again.
     
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