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Discuss Hot water staying on all night despite controller being off in the Central Heating Forum area at UKPlumbersForums.co.uk.

  1. Peter Laing

    Peter Laing New Member

    Good Morning All,
    Further to my previous post about my pump running all night, I've now done some further investigation at 3am this morning and realised it's different than I originally thought.

    We have a Glow-worm Ultracom 30hxi boiler that feeds our central heating and hot water. It’s controlled by a Drayton Lifestyle controller. The pump is a Grundfos Type UPS 15-60 130 Part number 5952660 and there are two motorised values sitting below the pump - one for the heating, one for the hot water.

    At 3am this morning, the pump was running and by feeling the temperature of the pipes, I established the two valves were set such that the pump was feeding the hot water tank. Downstairs, I checked the boiler and it was running, though the timer/controller said it was all off, which it should have been at that time of the morning.

    The other thing I noted is that the boiler temperature gauge was steady at around 70 degrees, then every minute or two the boiler would fire up and the temp would rise to around 90 degrees, the cut out, when the temp would slowly fall to 70 again. Whilst the heating/hot water is working during the day, the temperature display goes between 60 and 80.

    I'd confirmed this previously by setting a temperature monitor on the pump for 48 hours and right enough, this showed that the pump temperature was about 45 degrees whilst the heating/hot water was on, but when the heating/hot water went off at night (according to the timer controller), the temperature of the pump slowly rose up to about 55 degrees, by which time the heating kicked in again, i.e. 5am in the morning, when the temp of the pump fell sharply down to 45 degrees again.

    This is all piecing together with my other problem posted elsewhere on this forum about our two power showers being extremely hot. This problem started around the same time I noted the pump was running all night. It seems like the boiler is running hotter than normal at night and probably super-heating our water all night.

    Please help me understand what's going on here!
     
  2. SimonG

    SimonG Trusted Plumber

    Issue with two port valve giving a permanent live to boiler and pump.
     
  3. Peter Laing

    Peter Laing New Member

    Thanks Simon - where would I find this two port valve? Are they easy/expensive to replace?
     
  4. daWilko

    daWilko Member

    Hi - The timer should rule the roost, but the sticky valve explains this (edited my earlier post :rolleyes:)
     
    • Creative Creative x 1
    Last edited: Feb 11, 2018
  5. Peter Laing

    Peter Laing New Member

    Thanks daWilko - can you explain this to me in a little more detail please? Which valve is sticky and how would this make the system run all night despite the controller being off?
     
  6. Gasmk1

    Gasmk1 GSR

    because the 2 port valve although a switch the timer only open the valve there is a pemanent live to the micro switch so if the valve sticks open or the microswitch is faulty it will supply power to the boiler
     
    • Agree Agree x 1
  7. daWilko

    daWilko Member

    The 2 port valve towards the hot water likely to be faulty.
     
  8. townfanjon

    townfanjon Trusted Plumber GSR Top Contributor!!

    Yep, what make are the valves ?
     
  9. Peter Laing

    Peter Laing New Member

    Hi, I'm still a bit confused by what you mean by 2 port valves, but if you mean the two electric valves (one for heating, one for hot water), they're Drayton Zone Valve Actuator, Actuator Code ZA5
     
  10. Gasmk1

    Gasmk1 GSR

    2 port means one inlet and outlet 3 port means 1 inlet 2 outlets pretty simpole terminology really thats the way we refer to them iether a 2 port zone valve or a 3 port (diverter)
     
  11. Peter Laing

    Peter Laing New Member

    Thanks Gasmk1 - makes sense now you've explained it!
     
  12. Murdoch

    Murdoch Active Member

    If the programmer is off for both water and heating , said valve shouldn't have any power to it....
     
    • Dislike Dislike x 1
  13. Riley

    Riley Plumber GSR Top Contributor!!

    It can they will have a permanent live so if the micro switch is stuck it doesn’t matter if the controls are off. Heating systems are just a series of switches
     
  14. Murdoch

    Murdoch Active Member

    Rarely does the permanent live go to the valve .. in my experience as a spark...
     
  15. Riley

    Riley Plumber GSR Top Contributor!!

    I am not doubting your expertise as I am a firm believer in why have a dog and bark yourself, I actually use very good electrician for a lot of System testing. However rightly or wrongly we have come across this exact issue three times in the past couple of months where the boiler is getting a constant switch live back from the valve.
     
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