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Discuss Only one working radiator in the Central Heating Forum area at UKPlumbersForums.co.uk.

  1. CHRI1111

    CHRI1111 New Member

    Hello all,

    I was hoping someone could help me solve and repair my central heating issue.

    Only a single radiator works in the property in the bathroom.

    This room is located directly above the boiler on the first floor. The boiler is located within the kitchen on the ground floor.

    I notice when the boiler fires up the pump says 1 watt, then a few seconds later has two dashes.

    All the other radiators are stone dead cold.

    Any ideas?

    15028864903732069098027.jpg

    1502886520609257108258.jpg

    15028865681471527146511.jpg

    15028865945772024107388.jpg

    15028867236521967266810.jpg

    1502886757984478974403.jpg

    15028867821001159229094.jpg
     
  2. CHRI1111

    CHRI1111 New Member

    Correction-
    A second radiator in the adjacent bedroom is warming up, to include its outlet pipe.

    The third radiator in the second bedroom is cold, but notice the inlet pipe is luke warm. The central heating system has now been on for 30 minutes.

    When I tested the system in Winter 2016 only one radiator got hot, so a little improvement since then for some reason.

    Chris.
     
  3. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Take the trv heads off and does the pin push down ? Also lift it till it stops don't force it up too much you should have heating
     
  4. JCplumb

    JCplumb Plumber

    The only reference I can find to the 2 dashes shown in your pic is here:
    http://us.grundfos.com/content/dam/GPU/Literature/ALPHA2/99187617_0217_ALPHA2_IO_Internet.pdf
    It seems to be an indication that the supply voltage is too low.
    Whether that's normal when there is no call for the pump to run I don't know. Hopefully someone else on here has more experience with this particular pump.
    The fact that only one rad upstairs above the boiler is getting hot indicates a pump problem most of the time. Your boiler may also lock out during calls for heating because the hot water isn't dispersing quickly enough.
    Doesn't look like you have access to check the return pipe temp while it's running.
    I'd say most people would need to call a heating engineer in this situation.
     
  5. CHRI1111

    CHRI1111 New Member

    My boiler does keep cutting out, so I suspect the pump is either jammed or faulty?
     
  6. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Try this

    Press and keep pressing the grey arrow point so it fills the II mark
     
  7. CHRI1111

    CHRI1111 New Member

    This is the trv. Does push down.

    15028934667371570012896.jpg
     
  8. CHRI1111

    CHRI1111 New Member

    I've pressed the arrow some 40 times but nothing has changed on the display
     
  9. CHRI1111

    CHRI1111 New Member

    I've also put my hand on the pump and cannot feel it vibrating.
     
  10. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    While it's on / got power?
     
  11. CHRI1111

    CHRI1111 New Member

  12. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Are the other trvs like this one easy to push down and up ?
     
  13. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    I would say new pump then sorry to say

    Should adjust
     
  14. CHRI1111

    CHRI1111 New Member

    The other upstairs radiators don't have trv's - got these:

    Not sure how to check these?

    15028939044171777211936.jpg

    1502893940061425509311.jpg
     
  15. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    That's fine there lockshield valves won't go wrong unless there shut (anti clockwise to open if your wondering) but if they've worked before leave them point to either controller not giving power to the pump or duff pump

    Do you have a multi meter?
     
  16. steadyon

    steadyon Active Member

    Could be the bathroom radiator is on the hot water primary circuit with either central heating not called for or a duff motorised valve.
     
  17. CHRI1111

    CHRI1111 New Member

    I've never turned those off and the system used to work fine.

    I don't have a multimeter unfortunately, would that be to check the power to the pump? I am wondering whether I can try and turn the pump manually to see if it's siezed but don't see a screw on the front to get access?
     
  18. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    That's fine

    And yes to eliminate the programmer any chance of another pic close to the bottom of the cylinder/ can you see a port valve

    Like in the pics below?

    IMG_2930.JPG

    IMG_2931.JPG
     
  19. CHRI1111

    CHRI1111 New Member

    As in this thing?

    1502895306465952871068.jpg
     
  20. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Yes can you hear that moving (should click and pump turn on)
     
  21. CHRI1111

    CHRI1111 New Member

    I think so. Very faint but there is a single click. Tried to upload sound file but won't let me.
     
  22. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    That's it, I would say pump but without checking the voltage to the pump can't be 1000% sure
     
  23. CHRI1111

    CHRI1111 New Member

    Is it worth checking whether the pump is seized?
     
  24. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    The only way with the erp series is to take the pump out completely, there's not a manual air vent like the old series used to have
     
  25. CHRI1111

    CHRI1111 New Member

    Ah that's a shame. Oh well if im.takibg the thing off I may as well replace it! I've found a you tube video explaining how to replace, but I'm guessing I'l need to drain the system down as I can't find the isolation valves to the pump itself.
     
  26. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Yes and replace the pump valves as there the type to leak if touched
     
  27. CHRI1111

    CHRI1111 New Member

    Thanks for your help.
     
  28. Sparkgap

    Sparkgap Active Member

    Can I suggest before ripping it out disconnect the pump supply and put it on a plug and extension lead to try it. it wouldn't be the first time I've found dodgy switch contacts meaning the pump isn't getting voltage.
     
  29. CHRI1111

    CHRI1111 New Member

    I may get someone to do it for me as there seems to be a lot involved. Can't find a drain valve now. Any ideas of what I should expect to pay for this?
     
  30. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    But then the display wouldn't light up ?

    And op your best having a few plumbers quote
     
  31. Sparkgap

    Sparkgap Active Member

    Basic version: dodgy contacts can cause high resistance. When the pump is off load the voltage is high enough to run the display. When the pump load increases the resistance causes the voltage to drop. LED displays don't need much to run but motors do, hence the 'fault'.
     
  32. heliotrope

    heliotrope Plumber GSR

    Has no one noticed that the pump valves appear to be in the
    closed position?
     
  33. CHRI1111

    CHRI1111 New Member

    Where are the pump valves? I can't see any.
     
  34. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    They look open to me
     
  35. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Below the pump brass connectors the raised notch
     
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