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Discuss Faulty NEST heat link? in the Central Heating Forum area at

  1. Gambler71

    Gambler71 New Member

    I am bench testing a Nest and Heat link. Wired it up as per instructions. Neutral and live, plus the live being linked to terminals 2 and 5. On a multimeter there is 240V between neutral and live, neutral and terminal 2 and neutral and terminal 5. When there is no demand for heat from the NEST and the hot water is switched off, the multimeter sees approximately 170V between neutral and terminal 3. Should this be zero?
    Last edited: Dec 5, 2018
  2. Gambler71

    Gambler71 New Member

    I also note that when the app and thermostat shows that the hot water is OFF, there is 240v at terminal 6 and the boiler fires up the hot water heating.
  3. carrpaul

    carrpaul GSR

    Hi there , yes to convert 4 pipe system boiler
    ( Worcester ) back to 2 pipe you do need to change the code plug .
  4. Frog67

    Frog67 GSR

    Check HW connections on cylinder stat
    Common should be the switched live
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