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Hot water pump constantly stop-starting

  • 02-03-2010 8:27am
    #1
    OSI
    Moderators, Motoring & Transport Moderators Posts: 265 Mod ✭✭✭✭


    Hi guys just a quick question.

    Just moved into our new apartment and the hot water pump (the pump on the floor beside the hot water tank) seems to be constantly stop-starting since we turned the boiler back on.

    ie, it will start, run for about 5 seconds and then stop, wait for another 5 seconds and then start again. This is happening regardless of whether the boiler is running or not.

    Any ideas what this could be? There is a pressure gauge on the top that reads 1.5 bar while it is running and drops to below 0.5 bar before the pump starts again.


Comments

  • #2
    ocokev
    Closed Accounts Posts: 373 ✭✭ocokev


    You seem to have a run off of water somewhere.
    Check for dripping taps or a toilet bowl with water constantly flowing from the cistern. To do this have the bowl dry for some time and put some tissue resting under where the water normally flushes if tissue gets wet your water is constanty flowing hence the pump continually going.


  • #3
    items
    Closed Accounts Posts: 672 ✭✭✭items


    Most twin impeller pumps(hot / cold) will only activate when pressure switch detects a loss of pressure within outgoing pipe work. Like above you could have a slight leak somewhere causing loss of pressure, two leaks that come to mind is overflowing toilet and dripping bath/shower mixer.

    If you cant find any leaks then you might have an issue with pump, if pump is negative head (small vessel mounted on top of pump) the vessel could be damaged meaning pump struggles to pressurize pipe work.

    To find out where problem is, your pump should be supplied through 4 valves, if you can locate pumps two outlet valve's close of both and listen out, if pump remains silent then you've probably a leak, if pump still comes on / off even though outlet valves are closed then you could have a problem with expansion vessel.


  • #4
    items
    Closed Accounts Posts: 672 ✭✭✭items


    I might not have wrote up clear enough info, its the two outlet valves you should close (on pipe work you mention going behind tank into wall). What you did was turn off supply valve, prob hot supply and pump dry run protection kicked in (flashing red light). If you closed hot valve, without running off a hot tap and pressure dropped within outgoing pipe work, this could be an indication of loss of water somewhere along hot water pipe work.

    To be sure, with all valves open, taps closed and outgoing pipework under pressure close outlet valves and monitor pump for a few mins.

    The problem cant be determined by turning off inlet valves, this only confuses things, remember valves on pipe work going into wall to be closed.

    If a leak is main problem, pump should stay silent when outlet valves closed.

    Let us know how you get on.


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