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Myson Compact CP53 Replacement?

  • 22-05-2018 9:05am
    #1
    Sleepy
    Registered Users, Registered Users 2 Posts: 24,367 ✭✭✭✭


    Our gas boiler (Micron Gloworm) is cutting out within a minute or two of being started. The boiler will fire up when started from cold, but cuts out before firing on any attempt to re-start it when it's warm. The boiler was serviced a few months back so I'm thinking the problem is with the pump and the boiler's thermostat is stopping it from running as it's not getting a feed of cold water?

    The circulating pump (a Myson Compact CP53) doesn't appear to be kicking in when the boiler starts. I've removed the plastic nut and was able to rotate the metal bolt a both clockwise and anti-clockwise, pulling it out gave me water rather than air so if I'm not mistaken that means it's neither a case of the pump being seized or airlocked. It makes absolutely no noise (and I can feel no vibration) when the boiler is started so I'm guessing that this means the pump is just shot and needs replacing. AFAIK, the pump should kick in as soon as the boiler starts rather than after a time-delay etc?

    There are valves either side of the pump so wouldn't expect it to be too difficult a job once the replacement pump is the same size as the existing one

    As I understand it Myson are no more. I see the Grundfos 15/50 recommended as a replacement unit on-line. Would this still be the best model to replace it with and, if so, where's the best place to source one?

    Incidentally, we have 11 rads in the house and since we moved in some have never really heated properly unless others were turned off (despite my efforts to balance the system and all rads being bled). Could the pump simply not have been powerful enough for that many rads? Or could it being on it's way out have been part of the problem? Would I be better to look at installing an "upgrade" to a slightly more powerful pump than carrying out a like-for-like replacement?


Comments

  • #2
    DGOBS
    Hosted Moderators Posts: 3,496 ✭✭✭DGOBS


    Could be many reasons why your not getting heat to all rads, but standard pump should suffice.

    Bad new is, it's not a straight forward as you think to change, as the isolating valves either side of the pump are sure to start leaking once you use them, so normally the system will need draining and both valves and pump replaced.


  • #3
    Sleepy
    Registered Users, Registered Users 2 Posts: 24,367 ✭✭✭✭Sleepy


    Draining the system wouldn't be a massive issue for me, I've done that before when changing some radiator valves and flushing the system, will keep the necessary at the ready in case it's something I need to do. The boiler is upstairs in the hot water tank so if I get a leak from the valves, I can drain the system to below that level pretty quickly.


  • #4
    Sleepy
    Registered Users, Registered Users 2 Posts: 24,367 ✭✭✭✭Sleepy


    Finally got around to replacing the water pump over the weekend and it went pretty well. The valve on the outflow side of the pump was a bitch to get off the pump but got there in the end. The Grundfos was a straight swap in for the old pump and the heating is now working again.

    Delighted to fix it with a €70 part off eBay (new) instead of an expensive call-out and Irish plumber's merchant prices for the pump.


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