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

Boiler kettling - Glowworm Fuelsaver F

Discussion in 'Plumbing and Central Heating' started by Docbill, 1 Dec 2018.

  1. Docbill

    Docbill

    Joined:
    1 Dec 2018
    Messages:
    6
    Thanks Received:
    0
    Country:
    United Kingdom
    Boiler: Glowworm fuelsaver F45

    Symptom: Once up to heat, boiler runs for 30sec -minute then turns off as is overheating.

    Actions: 1 Have drained the system several times and each time added stronger cleaner, Fernox, sentinal , wickes own, the final was Fernox Ds40 - citric acid. No improvement.

    2 Have just spent several hundred pounds having the system powerflushed with water and magnet cleaner. The engineering added Fernox f2 the week before to pre-treat - when compared to the videos on line not much really came out - the magnets were ringed rather than fully coated. So happy system is as clean as it can be. Also changed the 3 way valve and added a Fernox omega filter.

    However, the problem persists. The engineer now says it is the heat exchanger but he will not investigate it further and is recommending a new boiler.

    I live near the South Downs in Hampshire so water is very hard, so probably the heat exchanger is full of calcium deposits?

    The boiler is 30 years old (has not been run hard - I am comfortable at 16'-18') and the part is obsolete so replacing it is probably not an option. So can it be cleaned - whilst in situ or remove it and clean with descaling acid outside? Are there any filters which may be blocked?

    Can anyone suggest another solution or better still is there any one in south Hampshire, woth experience of this who can come and provide a solution.

    Here's hoping!
     
  2. Sponsored Links
  3. Mottie

    Mottie

    Joined:
    27 Feb 2017
    Messages:
    19,450
    Thanks Received:
    1,941
    Location:
    Essexshire
    Country:
    United Kingdom
    I'm no heating expert but I t does sound like you are chucking good money after bad. 30 years old? If parts are obsolete, it may be time to cut your losses and fit a new boiler?
     
  4. ianmcd

    ianmcd

    Joined:
    15 Aug 2010
    Messages:
    23,966
    Thanks Received:
    10,065
    Location:
    Livingston
    Country:
    United Kingdom
    new boiler time and fit a scale reducer at the same time if you are in a hard water area, and dont expect your replacement boiler to last 30 years
     
  5. Docbill

    Docbill

    Joined:
    1 Dec 2018
    Messages:
    6
    Thanks Received:
    0
    Country:
    United Kingdom
    Thanks for taking the time to reply.

    I was however looking for help with finding some experts in my area. I have contacted Glowworm and asked them to confirm the part numbers and suggest an expert but sadly have had no reply.

    Changing boiler is not possible at his stage without significant rework of the system - apparently my existing boiler exhaust comes straight out of the side of the boiler and unfortunately the new ones only come out of the back or the top. So this would result in a complete re-do of the kitchen which I do not have time or funds to do.
     
  6. fixitflav

    fixitflav

    Joined:
    20 Mar 2018
    Messages:
    1,324
    Thanks Received:
    152
    Location:
    Stoke-on-Trent
    Country:
    United Kingdom
    Does it re-start after cooling a while? Or does it need a manual reset? If the latter, it could be the control-stat faulty. It's a "filled system" and sometimes the working fluid leaks. Not hard to replace, if you can find the part I guess your plumber would be happy to fit it.
     
  7. ollski

    ollski

    Joined:
    8 Oct 2003
    Messages:
    7,090
    Thanks Received:
    543
    Location:
    Bristol
    Country:
    United Kingdom
    What happens if you turn the boiler stat down to number one?,they do go out of calibration and the scale in the hi can prevent accurate temperature sensing especially after 30 plus years
     
  8. Docbill

    Docbill

    Joined:
    1 Dec 2018
    Messages:
    6
    Thanks Received:
    0
    Country:
    United Kingdom
    Thanks. Boiler relights once it is a bit cooler. Last engineer will not touch it as the heater unit has asbestos. As for the stat knob I will try it and see what happens. I generally have it between 3 and 4, 5 is highest. Can it be recalibrate? The last engineer said to try a new pump, old one is grunfos USB, and will be over 20 years old, but appears to be working, but will a newer one push the water around better?
     
  9. fixitflav

    fixitflav

    Joined:
    20 Mar 2018
    Messages:
    1,324
    Thanks Received:
    152
    Location:
    Stoke-on-Trent
    Country:
    United Kingdom
    If when the boiler's firing you turn the control-stat down till it clicks , does it go out? And then fire again when you turn it up again? (with a fair bit of hysteresis). If so it's basically OK. If the fluid has leaked out boiler only stops when turned right down, which opens the contacts with no help from the diaphragm.
     
  10. Sponsored Links
  11. Docbill

    Docbill

    Joined:
    1 Dec 2018
    Messages:
    6
    Thanks Received:
    0
    Country:
    United Kingdom
    Thanks very much. I will try this later this weekend and let you know.
     
  12. fixitflav

    fixitflav

    Joined:
    20 Mar 2018
    Messages:
    1,324
    Thanks Received:
    152
    Location:
    Stoke-on-Trent
    Country:
    United Kingdom
    And does it need manual reset?
     
  13. Docbill

    Docbill

    Joined:
    1 Dec 2018
    Messages:
    6
    Thanks Received:
    0
    Country:
    United Kingdom
    No manual reset. It just keeps cycling-- turn on , “overheat”, switch off, cool down a bit and switch on etc. When I say cool down I guess that the pump has pumped some cooler water into the boiler? I have never done a manual reset, how is this achieved?
     
  14. fixitflav

    fixitflav

    Joined:
    20 Mar 2018
    Messages:
    1,324
    Thanks Received:
    152
    Location:
    Stoke-on-Trent
    Country:
    United Kingdom
    OK so it doesn't sound like failure of the control-stat.
    Manual reset needed if the boiler trips out on the lmit (overheat) stat. Usually a button pops out, and you click it back in.
     
  15. Docbill

    Docbill

    Joined:
    1 Dec 2018
    Messages:
    6
    Thanks Received:
    0
    Country:
    United Kingdom
    Thanks.

    Have fitted a new Grundfos Alpha pump. No real change. However, the old pump was original so the same age as boiler. The pipes were approx 1/3 blocked with baked on limescale/ other. I believe therefore that it is likely that heat exchanger could be the same.



    To summarise, have changed pump and three way valve and powerflushed. Used a whole pack of DS40, X400 and numerous other cleaners none of which appear to have touched the baked on limescale. So only option left is to find a properly experience heating engineer in south Hampshire to come out and remove heat exchanger and apply spirit of salts to the heat exchanger. If anyone can recommend a person please let me know.
     
  16. JohnD

    JohnD

    Joined:
    15 Nov 2005
    Messages:
    74,999
    Thanks Received:
    4,349
    Location:
    Crossgates, Europe
    Country:
    Cook Islands
    It may be worth adding Sentinel X200

    This is not an acid, it contains a chemical that limescale will dissolve in. You add it to the circulating water and don't drain it out.

    I had great doubts before I tried it but it does seem to work. It may take a couple of weeks, and you may need more than one litre.
     
  17. 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