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Honeywell motorised valve.

Discussion in 'Plumbing and Central Heating' started by Des Jennings, 28 Apr 2021.

  1. Des Jennings

    Des Jennings

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    Is it possible to keep a Honeywell valve in the manual position to provide central heating? My Bosch boiler isn't firing for CH but does for HW and I suspect the valve, although it's only three months old! I am hoping to get an engineer out after the bank holiday but I still need heating.

    Thanks.
     
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  3. stem

    stem

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    There's a microswitch inside the valve that starts the boiler when the valve is fully wound across by the motor, the manual lever only part opens the valve and doesn't normally move it far enough to operate the switch. So whilst the valve will be open with the lever in manual, you will find that it probably won't start the boiler.
     
  4. Des Jennings

    Des Jennings

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    Thanks. What I have found is that moving the lever to manual starts something off, I can hear it, but the lever quickly returns to automatic.
     
  5. ianmcd

    ianmcd

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    if you manually latch the valve in the manual position, you will get heating as long as there is a demand for HW, you may need to put the HW to constant and lift off the cylinder thermostat though as once the cylinder is satisfied the CH will also go off
     
  6. Des Jennings

    Des Jennings

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    Thanks. I'll wait for the boiler to be looked at.
     
  7. Harry Bloomfield

    Harry Bloomfield

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    The cylinder stat will only held to the cylinder by a curtain type spring, it will only take a minute to unclip it and leave the stat to one side.
     
  8. Des Jennings

    Des Jennings

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    Out of interest, when the programmer switches on the CH, do the boiler, pump and valve activate simultaneously or does the boiler fire up first. The Honeywell valve always lights up even when nothing else does.
     
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  10. Harry Bloomfield

    Harry Bloomfield

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    The sequence is time clock, thermostat, then valve actuator which then finally triggers the boiler and pump. So unless everything else says go, the boiler will not run - you would not want your boiler running, against a closed valve.
     
  11. ianmcd

    ianmcd

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    what light ? show a pic please
     
  12. Des Jennings

    Des Jennings

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  13. ianmcd

    ianmcd

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    That is not a Honeywell motorised valve
     
  14. CBW

    CBW

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    No mate, the name Myson gives it away :LOL:.

    Des, to latch that open, you have to manoeuvre it to the lower position. Is it definitely the valve at fault?
     
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  15. ianmcd

    ianmcd

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    About as relieable as a mobile phone
     
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