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Vokera Mynute 25a pump noise

  • 19-04-2013 1:26pm
    #1
    martineire
    Closed Accounts Posts: 328 ✭✭


    Hi guys, I'm just after installing a vokera mynute 25a gas boiler installed bout 2 weeks ago. I've just after getting a call back because the householder has noticed that the pump has just after starting making a loud humming/vibrating noise from it when I have the boiler on, it's also like u can hear a slushing sound from the pump, a crackling noise , pump is also fairly hot. It does not make this noise straight away only after its being on about 20 mins and just when hot water is selected. House has 3 zones UF, 1st floor and 2nd floor ( two motorised valves) room stat on each floor and cylinder stat Any ideas?


Comments

  • #2
    Dtp79
    Closed Accounts Posts: 2,097 ✭✭✭Dtp79


    martineire wrote: »
    Hi guys, I'm just after installing a vokera mynute 25a gas boiler installed bout 2 weeks ago. I've just after getting a call back because the householder has noticed that the pump has just after starting making a loud humming/vibrating noise from it when I have the boiler on, it's also like u can hear a slushing sound from the pump, a crackling noise , pump is also fairly hot. It does not make this noise straight away only after its being on about 20 mins and just when hot water is selected. House has 3 zones UF, 1st floor and 2nd floor ( two motorised valves) room stat on each floor and cylinder stat Any ideas?

    Did you flush the system prior to installing the boiler?


  • #3
    K.Flyer
    Registered Users, Registered Users 2 Posts: 8,565 ✭✭✭K.Flyer


    + 1 on the flushing,
    also it sounds to me that there is still air in the system and its not venting properly.


  • #4
    martineire
    Closed Accounts Posts: 328 ✭✭martineire


    I gave it a hot and cold flush. House and heating system is bout 3 years old. I vented all rads and vented boiler at the vent point on top of boiler. Was not making noise for the first couple of weeks. Boiler is covered for parts and labour for 2 years, vokera heating engineer is calling out Monday morning


  • #5
    Dtp79
    Closed Accounts Posts: 2,097 ✭✭✭Dtp79


    martineire wrote: »
    I gave it a hot and cold flush. House and heating system is bout 3 years old. I vented all rads and vented boiler at the vent point on top of boiler. Was not making noise for the first couple of weeks. Boiler is covered for parts and labour for 2 years, vokera heating engineer is calling out Monday morning

    What chemicals did u use when flushing?


  • #6
    martineire
    Closed Accounts Posts: 328 ✭✭martineire


    Fernox


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  • #7
    JohnnieK
    Registered Users, Registered Users 2 Posts: 2,526 ✭✭✭JohnnieK


    +1 on the Vokera call out. If the pump is getting very hot it could be a faulty pump.


  • #8
    martineire
    Closed Accounts Posts: 328 ✭✭martineire


    If the flow and return were reversed could that cause a problem?


  • #9
    Dtp79
    Closed Accounts Posts: 2,097 ✭✭✭Dtp79


    martineire wrote: »
    If the flow and return were reversed could that cause a problem?

    Honestly don't know what'd happen. I've seen it on a vokera and it was not going into high fire for some reason. That's not your situation though. If there's no other pumps on the system I can't see it being an issue except for at the cyclinder


  • #10
    martineire
    Closed Accounts Posts: 328 ✭✭martineire


    No other pumps on the system, why what problem could u see at the cylinder? Vokera engineer was out today, apparently he said he couldn't pin point the problem, and said its prob a faulty pump, so he replaced the pump head but the householder said the problem still exists.


  • #11
    Dtp79
    Closed Accounts Posts: 2,097 ✭✭✭Dtp79


    martineire wrote: »
    No other pumps on the system, why what problem could u see at the cylinder? Vokera engineer was out today, apparently he said he couldn't pin point the problem, and said its prob a faulty pump, so he replaced the pump head but the householder said the problem still exists.
    The problem at the cyclinder would be that the flow is on the bottom coil and return on top. Is it a sealed system?


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  • #12
    martineire
    Closed Accounts Posts: 328 ✭✭martineire


    Yes it is a sealed system. I could be wrong but I couldn't see the flow to the bottom of cylinder being a problem really, don't some plumbers actually pipe the flow to the bottom cylinder anyway.


  • #13
    Dtp79
    Closed Accounts Posts: 2,097 ✭✭✭Dtp79


    martineire wrote: »
    Yes it is a sealed system. I could be wrong but I couldn't see the flow to the bottom of cylinder being a problem really, don't some plumbers actually pipe the flow to the bottom cylinder anyway.

    Ye they do. As I said its probably the only thing that wouldn't be the norm that's all.


  • #14
    martineire
    Closed Accounts Posts: 328 ✭✭martineire


    Think I might have cracked the problem, there is no bypass on the system just after goin back and having a look. The old boiler must of havin a bypass build into the boiler.


  • #15
    Dtp79
    Closed Accounts Posts: 2,097 ✭✭✭Dtp79


    martineire wrote: »
    Think I might have cracked the problem, there is no bypass on the system just after goin back and having a look. The old boiler must of havin a bypass build into the boiler.

    U sure there's no bypass in this boiler?
    If the bypass was the problem then the noise would only happen when all zones are closed off


  • #16
    K.Flyer
    Registered Users, Registered Users 2 Posts: 8,565 ✭✭✭K.Flyer


    martineire wrote: »
    Think I might have cracked the problem, there is no bypass on the system just after goin back and having a look. The old boiler must of havin a bypass build into the boiler.
    As far as I know all of the Mynute system boilers have built in Bypass Valves so that is unlikely the problem.
    Are all the rads heating correctly and does the noise occur while the system is heating up?


  • #17
    martineire
    Closed Accounts Posts: 328 ✭✭martineire


    Sorry men just after looking up the manual this boiler has a bypass cartridge build into the manifold. So then I presume this boiler does not need an external bypass to be installed. Now I'm scratching my head again.

    Yea when the boiler is on about 20 mins and everything is heating up nicely the pump starts making a very loud vibrating noise, fiddle around with the pump speeds it seems to help


  • #18
    Dtp79
    Closed Accounts Posts: 2,097 ✭✭✭Dtp79


    martineire wrote: »
    Sorry men just after looking up the manual this boiler has a bypass cartridge build into the manifold. So then I presume this boiler does not need an external bypass to be installed. Now I'm scratching my head again.

    Yea when the boiler is on about 20 mins and everything is heating up nicely the pump starts making a very loud vibrating noise, fiddle around with the pump speeds it seems to help

    Is there an inline filter that maybe partially blocked. Definately no harm to have an external bypass by the way. Furthest from the boiler is best. Send DGOBS a pm and your Rgi number and you'll be given access to the Rgi tech forum. Maybe one of the lads there have come across this problem before. They've helped me out alot in the past


  • #19
    martineire
    Closed Accounts Posts: 328 ✭✭martineire


    Yea my guess there is a blockage at the bypass cartridge, ill inspect tomorrow and all will be revealed. thanks and yea ill pm DGOBS my RGI number so I can't access that forum


  • #20
    esox28
    Registered Users, Registered Users 2 Posts: 800 ✭✭✭esox28


    From what you have posted the vibrating only starts when dhw is selected and bout 20min into heat time which could be the bypass valve actually opening and closing at a fast rate much like water hammer on mains supplies, two things to- do to check is open the balancing valve on cylinders coil, also as Dtp was saying install a bypass at the further point in the system.

    Also +1 on removing the bypass and checking for dirt blocking up, also the old plumbers trick of blowing through it, needs to be moderate force to open roughly (very roughly)


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