Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

Problems with Grundfos shower pump

  • 12-02-2010 5:40pm
    #1
    Registered Users, Registered Users 2 Posts: 183 ✭✭


    Hi folks,

    Dunno if you've come across anything like this, but any help would be appreciated.

    We just had a pump installed to supply the two bathrooms in the house and it's working great, except that sometimes when you use a hot water tap elsewhere in the house, that isn't plumbed to the pump, it starts pulsing. It keeps going on and off in one second intervals and has to be switched off.

    It's scary, I didn't want to see for how long this can last because I'd imagine it's damaging the pump. The plumber doesn't seem to know what it could be but he's coming over next week to check.

    Grundfos suggested that it might be air in the system, but we've had a flange fitted to ensure an air-free supply of hot water and we've done everything they've suggested to get rid of possible air in the pipes. (running hot taps everywhere in the house)

    It's early days still but I'm not feeling confident that the plumber will know what to do and was hoping that someone might be able to point us in the right direction.

    Thanks!


Comments

  • Registered Users, Registered Users 2 Posts: 10,262 ✭✭✭✭Joey the lips


    You have a flange fitted and thats correct. Is the pump connect to the flange itself or is it on a T when it comes out of the flange and feeding the whole house.

    Can you take any pictures.


  • Registered Users, Registered Users 2 Posts: 183 ✭✭crótach


    The pump is fitted directly to the flange, as far as I can tell it's exactly as in the instructions.

    I took some photos of the installation and of the instruction sheet as well. Hope it helps!


  • Registered Users, Registered Users 2 Posts: 10,262 ✭✭✭✭Joey the lips


    Now that is a strange one. I do not know myself what it can be. Sorry.


  • Closed Accounts Posts: 3,305 ✭✭✭yoshytoshy


    It sounds like it's the head of water decreasing thats activating the pump.

    If that is the case ,I can't see anyway around the problem other than some sort of non-return valve on the shower feed ,to stop the pump picking up any change.


  • Registered Users, Registered Users 2 Posts: 10,262 ✭✭✭✭Joey the lips


    yoshytoshy wrote: »
    It sounds like it's the head of water decreasing thats activating the pump.

    If that is the case ,I can't see anyway around the problem other than some sort of non-return valve on the shower feed ,to stop the pump picking up any change.

    That should be an easy one to do. Its all done on pex. its actually a recoimendation that modern plant use to advise with its monsoon pumps. However since they started advising on surrey/warwick flanges this problem was gone.....until now.:(


  • Advertisement
  • Closed Accounts Posts: 3,305 ✭✭✭yoshytoshy


    That should be an easy one to do. Its all done on pex. its actually a recoimendation that modern plant use to advise with its monsoon pumps. However since they started advising on surrey/warwick flanges this problem was gone.....until now.:(

    I've never heard of this problem with a surrey flange either:(

    I didn't realise grundfos did pumps for showers ,I thought it was just pumps for unvented water systems:confused:.


  • Registered Users, Registered Users 2 Posts: 10,262 ✭✭✭✭Joey the lips


    yoshytoshy wrote: »
    I've never heard of this problem with a surrey flange either:(

    I didn't realise grundfos did pumps for showers ,I thought it was just pumps for unvented water systems:confused:.


    Nahh they took over salamander as far as i know. They are doing shower pumps at least 2 years... They have improved the pump and remoddeled it. You should remember salamander from your suppliers. ;)

    Yes it is a weird problem...not to scare the op..... But what ever it is. Grundfos have an excellent service record and I cannot see anything wrong with the connection so it might require a call out from grundfos.


  • Registered Users, Registered Users 2 Posts: 183 ✭✭crótach


    Thanks lads, I'll give Grundfos a shout on monday.

    I did check the instructions and it says a possible problem for the "pulsing pump" is a faulty non-return valve. We definitely don't have one installed.

    Just out of curiosity, where should it be fitted? On to one of the pump inlets/outlets, or somewhere else?


  • Registered Users, Registered Users 2 Posts: 10,262 ✭✭✭✭Joey the lips


    crótach wrote: »
    Thanks lads, I'll give Grundfos a shout on monday.

    I did check the instructions and it says a possible problem for the "pulsing pump" is a faulty non-return valve. We definitely don't have one installed.

    Just out of curiosity, where should it be fitted? On to one of the pump inlets/outlets, or somewhere else?

    Just before the pump inlets. NOT OUTLETS VERY IMPORTANT.AND MUST BE ON THE INLET IN THE RIGHT DIRECTION TO ALLOW FLOW IN.


  • Registered Users, Registered Users 2 Posts: 183 ✭✭crótach


    Ah, grand so. Should I get two non-return valves, one for hot and one for cold?


  • Advertisement
  • Registered Users, Registered Users 2 Posts: 20,226 ✭✭✭✭cnocbui


    Pressurise the whole house from the pump! :D


  • Registered Users, Registered Users 2 Posts: 10,262 ✭✭✭✭Joey the lips


    crótach wrote: »
    Ah, grand so. Should I get two non-return valves, one for hot and one for cold?


    Ring the plumber let the plumber pick 2 up or if you want you can.


  • Registered Users, Registered Users 2 Posts: 183 ✭✭crótach


    Lads, me again. I picked up two non-return valves at the weekend, the plumber should be in tomorrow. But I just went through the pump's manual and it says:

    " Do not fit non-return valves in the suction line to the pump. Make sure that the pump can vent back to the supply tank."

    Not sure what to do now :(


  • Closed Accounts Posts: 3,305 ✭✭✭yoshytoshy


    Crotach ,if theres a plumber going over to you ,let him work away at it.
    Somethings just need a hands on ,to fix them.


Advertisement