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actuator

An actuator is a component of a machine that is responsible for moving and controlling a mechanism or system, for example by opening a valve. In simple terms, it is a "mover".
An actuator requires a control signal and a source of energy. The control signal is relatively low energy and may be electric voltage or current, pneumatic, or hydraulic fluid pressure, or even human power. Its main energy source may be an electric current, hydraulic pressure, or pneumatic pressure. When it receives a control signal, an actuator responds by converting the source's energy into mechanical motion. In the electric, hydraulic, and pneumatic sense, it is a form of automation or automatic control.
An actuator is a mechanism by which a control system acts upon to perform an operation or task. The control system can be simple (a fixed mechanical or electronic system), software-based (e.g. a printer driver, robot control system), a human, or any other input.

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  1. E

    Danfoss HPA2 Actuator Stuck

    Hi everyone, my first post here so go easy on me... šŸ˜„ I have Danfoss HPA2 motorised valves fitted to my heating system and one of them is giving me problems again. Typical as its the same one I replaced in December 2022. The heating never came on today so I checked the valve and the lever on...
  2. J

    How to turn an actuator off ?

    Hi. I have underfloor heating controlled by these actuators. One of the behr actuators is stuck on. Can anyone help advise how to turn it off? The newer one on the right is easy to remove and see the pin. The other two donā€™t seem to have an easy method of removal. Can anyone help?
  3. Spike47

    3 Port Diverter Valve Actuator, Alternatives

    Hi I have a duff Honeywell 3 Port Diverter Valve Actuator V4073A, my mate has a new Honeywell V4043, would anyone know if they are interchangable, looked online but can't seem to find that info . He also has a Altech ALTHC041 !. cheers Stan
  4. D

    Changing a 3 port actuator valve

    My 3 way actuator valve has gone on my central heating. I think it's a combination of the valve motor burning out due to a stiff valve on the pipework. I'm considering doing the fix myself but wanted to check I know what I'm doing beforehand or whether I should get a plumber in, have I missed...
  5. D

    Thermal Actuator wiring

    Hi i am not a plumber, nor am I an electrician. Just recently purchased an underfloor heating thermal Actuator. The wiring is as follows, brown, blue, black, grey. The old actuator is red, red, yellow, yellow. can any one tell me what colour matches with what colour? Thanks
  6. T

    Drayton MA1 mid position actuator intermittent fault.

    Can anyone advise what could be the cause and how to overcome an actuator intermittently not responding when boiler is calling for heat. Possibly slightly loose fitting to valve, as actuator re-activates with hand pressure movement when boiler is calling for heat. This is an intermittent fault...
    • Tomcat
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    • Replies: 3
    • Forum: USA
  7. P

    Y plan system 3port actuator issues

    Hi After a home emergency insurance call the engineer to replaced the actuator motor a the 3port shoes (I watched him replace it) he plugged the header tank so he didnā€™t have to drain the whole system and replaced the whole motor and the shoe all be it a different model but it did the job...
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  8. A

    Why won't my Wavin Actuator fit on?

    I'm looking for an Heating Engineer/Plumber working in West London who can rebalance the UFH provided by my 20 yr old Wavin (formerly Osma) manifold. At the moment two of the rooms are overheating. I can't get the actuators, which have come off, back on. And one of the rooms is underheating...
  9. J

    Underfloor heating is stuck on - actuator issue?

    Hello. I am here for some advice please. We have a water underfloor heating system in our house and have recently had some issues with one of the zones seeming to overheat with the heat still being sent despite the thermostat not sending demand or even being on an all. These are all new...
  10. D

    Jammed actuator pins

    I have some actuator pins that are stuck (in the open position). I assume that the best thing to do is just to replace the entire valve, but is there a quick temporary fix - I.e. lubricating and hitting with a hammer (yes I know it's not the most professional solution) thanks
  11. L

    Actuator Valve (or something else?)

    I have a problem with my heating system (indirect unvented - with a cylinder). In order for the hot water to be heated my central heating needs to be on. If the central heating is not on (and the boiler is already fired up) the boiler does not fire up and heat water for the hot water cylinder...
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  12. E

    Vaillant ecoTEC plus 824 actuator motor cycling

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  13. M

    Thermostat and Valve Actuator reverse problem

    Hi, I have just installed a new Drayton zone replacement valve , model ZA5. The good news is that the value is working; however, the issue I'm experiencing is that when my thermostat turns the central heating on, the valve moves to the off position and the valve closes and when I turn off the...
  14. H

    Mid position actuator newly installed issue

    Hi, I had a Drayton ma1 mid position actuator recently installed as central heating had stopped working. Now my heating and hot water will not come on at the same time (with timed settings) and I have been advised that my thermostat is not working which is causing the problem (from the emergency...
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  15. A

    UFH actuator has started to close way before the room temperature is reached!!!

    Hi. First time poster here. My UFH doesn't heat up like it used to. I've isolated the issue (I think). It seems that whenever there is a call for UFH heat, the boiler fires up (like it used to), the actuator hums and opens up, the pump on the UFH manifold starts to run and the various valves on...
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  16. Spike47

    HELP Conundrum Midway Actuator wiring problem

    Hi I have just changed a Siemens 3 port midway Actuator, now I only changed like for like at the Main terminal box, but when I switched the system on only the hot water is working, turn tank stat down and wind up the room stat nothing. After fitting the same for same actuator, I noticed a bit...
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  17. M

    Mid Position Actuator compatibility

    Hi everyone - my first time posting here, but I have used invaluable advice posted on the forums many times so thanks for that. We have a 3 port valve in our heating system where the motor has died so I was just going to swap in a new head The original one is a Travis Perkins ikon MA1 - it...
    • mbfacefirst
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    • Forum: USA
  18. Y

    HW only heats when CH is also active... but actuator is good

    Hi All, I have a really weird (to me) issue/feature in a house we've just moved into. The CH and the HW work perfectly fine when they are both active. That is, when both are switched on at the control unit. However, if I switch the CH off but leave the HW on, the water doesn't heat. The boiler...
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    • Thread
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    • Replies: 7
    • Forum: USA
  19. I

    ufh actuator advice!!

    Need some advice and help! (I am not a plumber so will try and give as much info as i can) I have a room in my house with 2 loops of ufh in it. They are controlled by the same thermostat. They have separate actuators at the manifold as well. When the heating comes on one actuator opens fully...
  20. L

    Help... intermittent hot water issue

    My heating has developed a new and unwelcome quirk just recently, which is that it's sporadically failing to provide hot water. This is something that happened a few weeks back, but it seemed to go back to normal, but in the past couple of days it has happened again each day. We have a...
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