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Discuss No lights on Honeywell HCW80 relay unit in the Central Heating Forum area at UKPlumbersForums.co.uk.

  1. AskFrank

    AskFrank New Member

    Hi,
    My Honeywell HCW80 relay unit is not lighting up at all when I press or hold the button. I believe this fault is causing my central heating to have stopped. Looking behind the cover, things look fine, but I'm no expert. What would be the best course of action here?

    Picture of the relay unit I'm on about:
    [​IMG]
     
  2. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    Is this an rf receiver??
     
  3. garygvl

    garygvl GSR

    Yes it’s rf. if not switching on and off need to check getting 240v supply to it first before condemning it. If it has 240v supply to it it’s quite easy to bypass it and get heating back on until you get it replaced but depends on your competence with electrics
     
    Last edited: Feb 8, 2019
  4. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Should work if you press the button once / light should come on

    If it doesn’t needs investigation to see if it’s got power eg multi meter
     
  5. Markwirral

    Markwirral New Member

    Check room stat is turned up & batteries don’t need replacing in stat
     
  6. AskFrank

    AskFrank New Member

    Could I try and connect some of the terminals in order to send an ignition signal to the boiler? If so, what object could I use?
     
  7. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    Are you proficient otherwise I see a shock coming your way my friend
     
    • Agree Agree x 3
  8. garygvl

    garygvl GSR

    just being frank with you but dont use an object
     
  9. Chuck

    Chuck Well-Known Member

    This question indicates to me that you really need to stop at this point. You are going to electrocute yourself or end up with a face full of molten metal spray when you short the wrong things. Make it safe by putting the cover back on and call a heating engineer (or an electrician who does central heating controls) to get you sorted out.
     
    • Like Like x 2
  10. CBW1982

    CBW1982 Plumber GSR Top Contributor!!

  11. AskFrank

    AskFrank New Member

    Sorry guys only just seen these replies. I'm in A&E at the moment.
     
  12. CBW1982

    CBW1982 Plumber GSR Top Contributor!!

    Oh no! I hope it's not to treat for an electric shock? Hope you're ok.
     
  13. AskFrank

    AskFrank New Member

    Was just joking :)
    Managed to sort it out. The cover had come loose on one side so we've had to tape it down.
     
  14. CBW1982

    CBW1982 Plumber GSR Top Contributor!!

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