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Discuss Grant vortex overheat reset in the Oil and Solid Fuel Forum area at

  1. Westwalesboilerservicing

    Westwalesboilerservicing New Member

    I have a grant vortex oil boiler that keeps tripping the overheat stat. It is not a Combi boiler and happens at anytime of the day/night.
    Can someone point me in the right direction please.
  2. SimonG

    SimonG Trusted Plumber Top Contributor!!

    Get a competent oil engineer.
    • Agree Agree x 1
  3. oz-plumber

    oz-plumber Plumber

    Without trying to sound harsh.. overheat stats tripping are a relatively easy fault to find and rectify....most times.
    Have a think of what the reasons are - you might come up with an answer
  4. MikeJhn

    MikeJhn Member

    Have a look here, may help: New worcester oil boiler issues also what is the temperature of the boiler when it trips, could be a faulty overheat stat.
  5. Best

    Best Trusted Plumber Top Contributor!!

    You are not actually a boiler service person then?
    Your own property I guess?
    Overheat stat constantly needing reset means fault with overheat ...
  6. SimonG

    SimonG Trusted Plumber Top Contributor!!

    Just read your new member intro.

    Appreciate that your new to the trade, but pretty basic stuff.
    • Like Like x 1
    • Informative Informative x 1
  7. Best

    Best Trusted Plumber Top Contributor!!

    Oops, sorry, I didn’t read your intro post but had checked you were a brand new member.
    If boiler is running too hot (overheating the system water) and overheat is tripping, then overheat is working properly and there is only one other suspect.
    Although do make sure system has enough water pressure constantly , if sealed type
    • Like Like x 1
  8. SJB060685

    SJB060685 Top Contributor!!

    Here’s where I would look if this isn’t sorted.
    1. Could be as said above, the primary culprit could be a faulty boiler stat or misplaced boiler stat. This can be checked by seeing if phial is well sitted in its pocket on the side of combustion chamber. If in position then see if adjusting the control cuts boiler live while heating, if not then the stat is most likely the cause. You can use a thermometer as well inside boiler phial pocket to see temperature around phial and check with boiler dial.
    2. Air locks will cause the same problem, preventing hot water from being circulated away from burner. When this happens often the temperature increases so rapidly that the boiler stat can’t act quick enough to cut burner live and the overheat stat has to intervene.
    3. A faulty circulating pump could also cause this.
    4. If you’re in a hard water area scale could have formed on flow outlet preventing the circulation of heat, however this would usually cause a kettling noise as well.
    5. Similar to scale build up if the system is riddled with black iron oxide (sludge) then in theory depending on how bad this is it could cause the same.
    6. If it’s an open vented system then check the level of water in the feed and expansion tank in loft. If no water were present then the system will be low of water. However I don’t suspect this now due to what you have and more importantly haven’t said you’ve experiencing.
    Having said all this this is very basic stuff anyone working on boilers should know. Sorry if that makes me sound like an a***hole
    • Funny Funny x 1
  9. Westwalesboilerservicing

    Westwalesboilerservicing New Member

    I turned the temperature dial on the boiler down a few days ago and it hasn’t tripped since.
    • Like Like x 3
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