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switches

In electrical engineering, a switch is an electrical component that can disconnect or connect the conducting path in an electrical circuit, interrupting the electric current or diverting it from one conductor to another. The most common type of switch is an electromechanical device consisting of one or more sets of movable electrical contacts connected to external circuits. When a pair of contacts is touching current can pass between them, while when the contacts are separated no current can flow.
Switches are made in many different configurations; they may have multiple sets of contacts controlled by the same knob or actuator, and the contacts may operate simultaneously, sequentially, or alternately. A switch may be operated manually, for example, a light switch or a keyboard button, or may function as a sensing element to sense the position of a machine part, liquid level, pressure, or temperature, such as a thermostat. Many specialized forms exist, such as the toggle switch, rotary switch, mercury switch, push-button switch, reversing switch, relay, and circuit breaker. A common use is control of lighting, where multiple switches may be wired into one circuit to allow convenient control of light fixtures. Switches in high-powered circuits must have special construction to prevent destructive arcing when they are opened.

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  1. liopik

    Vaillant no power. Switches on for few seconds only.

    Hi everyone, I'm hoping to get some advice on an issue I'm having with my Vaillant Ecotec Pro 24 boiler (R1 PCB). It was installed in 2013 and has worked perfectly up until this week. When the boiler does start, it runs for a few seconds, makes some noises, and then shuts down again. I've...
  2. gavdtra

    Switches not working

    The on off timer switches on this don't work. I'm guessing there is a way to put it on timer mode instead of having to switch it on and off manually. Any ideas?
  3. B

    Three Port Valve bang when heating switches off.

    I have a Y-plan system with a Honeywell 4073 three port valve. The valve is several years old. There is a bypass gate valve across the HW cylinder coil. It is cracked slightly open as it always has been. The pump has always been on minimum speed and has not been changed. Since starting to use...
  4. A

    Baxi heat only boiler - switches off after a few minutes with a red flashing light

    Baxi heat only boiler (7 yrs old) - switches off after a few minutes with some banging noises followed by a red flashing light on boiler Reset the boiler manually after 5 mins and it runs fine all day Next day when i switch on the boiler on it does the same thing ive opened the screw on the pump...
  5. M

    Noise when heating switches off

    Hi there My central heating system has been making this noise when the heating switches off. It usually happens once the system is up to temperature. It’s happening upstairs and downstairs across the same 4-5 radiators. There are radiators in the system that done make this noise at all as well...
  6. T

    Central heating switches on when i turn the hot water on

    I have a Horstmann 425 Tiara with which can be programmed twice a day. When i set the hot water to come on but with the central heating turned off the cental heating still comes on at the time the hot water comes on Is there a way of overriding this or is it
  7. R

    My Boiler switches on in my Flat when neighbour uses water?

    Hi I live in a flat and my boiler switches/water on when my neighbour uses water - how can that possibly be and how can this be fixed as very annoying as working from home at the moment.
  8. N

    Netaheat switches off and back on again

    Any advice as to what is causing this. Maybe relevant? We had a power cut about 5 days ago - I don't think the heating was on at the time but the power cut caused the timer to be reset. It was the weirdest power cut I have ever experienced... the lights dimmed like some horror film.. but the...
  9. C

    Quick Question About Pressure Switches

    I have a 500 litre thermal store serving an old property that we are working through to replace most of the pipework, all of the rusty rads and to integrate a Heatmiser Neo control system with Emetti manifolds and control valves. Some UFCH comes later. For safety I want to add a pressure...
  10. S

    missing isolation switches between PV panels and inverter?

    According to one site, these should be fitted. But my recently fitted system, by professional/certificated installers, doesn't have isolation switches between the two PV strings and the inverter. It does have an isolation switch on the output of the inverter before it feeds the house between...
  11. K

    Boiler switches off -- no heating

    Hello everyone, My boiler has a problem since yesterday: it stays on for a few seconds and shuts off, then on again in about 10 minutes, then off after a few seconds and so on. The room thermostat sends the "switch on" signal fine (obviously, it is rather cold in the house now, so the...
  12. S

    Central heating switches off after 30 minutes - why?

    Hi, I have a problem with my central heating. Basically, even if I put the thermostat up to 30, the heating switches off after around 30 minutes or so. The house is only luke warm at this stage hence I need it on for longer. Any idea what is causing this? I did previously have an issue with air...
  13. D

    Knocking / Banging when hot water switches on

    Hi All I recently fitted a new shower and since then, everytime my hot water kicks in to get up to the set temperature, there is a knocking / banging noise that continues until it reaches the temperature. I have read a few things online about completely draining the tank and then turning the...
  14. N

    Siemens RWB2E slider switches

    Hello, We've been having a few issues with the central heating control unit. Last night I finally got round to reading the instruction manual but when I attempted to use the control unit (siemens RWB2E) the slider switches are completely stuck and will not move. We have been able to put...
  15. T

    Salus RT500 RF problem.

    I've only been at my present house just over a month and last night I found the central heating was still on at 3.30am which is way after the programmer should have made it go off. I have programmed the remote unit as per the manual and the 5th and last setting was set to 10 degrees which means...
  16. D

    Combi boiler not running long enough.

    Tried everything g I can. Rad balancing (new 2 years ago). Baxi 105 is not running continuously long enough to bring rads up to temp. House still cold after several hours of heating being on. Boiler switches on max temp, quickly reaches 90 degs according to indicator lights, but switches off...
  17. C

    salus rt500rf wont fire up the boiler?

    im wondering if anyone can help me? just had a sparky wire this up for me and im sure its wired up correct, i turn the thermostat up to 24 just to test and a little flame shows on the l.e.d the wireless reciever then clicks and a green light comes on but the boiler (baxi) doesnt fire up? any...
  18. M

    Loud bang when heating switches off

    Hi, I have recently moved into a new property where the heating had recently been installed, I have renovated the house so the boiler has been relocated and the radiators were all removed then refitted, the system is a gloworm boiler with two zones upstairs and downstairs with separate...
  19. G

    Biasi Riva M90E.32S Problem, getting running hot water but no central heating???

    Hi can someone please help I have a biasi boiler come home from work on new years day and i no longer have central heating. I have running hot water on demand but when i turn the thermostat on for the central heating it turns on for approx 10 seconds i hear the pump etc and then automatically...
  20. Meady

    Salamander force 30pt brass pump

    I fitted one of the above showers a while back and all was well for about 10 months. Then I had a phone call to say the pump stopped working, diagnosed as faulty flow switches so salamander sent out a new pump and all was good. just got another call today about a month later to say the pump has...
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