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Worcester 20/25 heatslave not firing

Discussion in 'Plumbing and Central Heating' started by Aqueousosprey, 28 May 2017.

  1. Aqueousosprey

    Aqueousosprey

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    Location:
    Peebleshire
    Country:
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    IMG_2193.JPG
    Looks like mine is 65c,
    Boiler still not right ☹️... it is still tripping the lock out but now it does not trip the fire valve??
    Seems to trip when high demand is on the boiler.. Anyone any ideas what to test now??
     
  2. dilalio

    dilalio

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    Boiler needs draining of water and drain valve left open whilst rest of heating circuit is isolated via shut-off valves, otherwise you'll need to drain whole rad system down to below boiler location. Then you pressurise vessel with air, using pump and gauge to MI specs (usually about 0.8bar). If it fails to hold that you'll need a new vessel. Also change auto vent whilst system is drained.
     
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  4. simond

    simond

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    If it is locking out on the burner control, and the fire valve hasn't now tripped, it could be for a number of other reasons, all to do with the burner.

    Fuel starvation is commonly to blame if it fails after a period of running.
     
  5. Terrywookfit

    Terrywookfit

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    The solenoid coil is usually the main culprit. It goes o/c when hot.
     
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