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  1. V

    Switchmaster actuator needed

    Back again from last weekend. My Switchmaster actuator 3 way valve won't move from CH plus HW, even though the HW is a satisfied. Tank stat works. Contoller works. 3 way valve is free. So I think it is the actautor. My lcoal plumbing shop offered a Honeywell replacement, but wiring is...
  2. V

    Central heating control

    I've noted that there has been some seepage from the valve itself, though this has occured below any wiring in the body of the actuator. But could this have a bearing on the problem? Your comments about a microswitch are also interesting. There is one of these in the actuator. It fails to...
  3. V

    Central heating control

    Possibly so. I've been doing tests this afternoon with the actuator off the valve. The actautar works ok moving from HW to HW plus CH. But it won't move to CH only once the water is hot and the tank stat is satisfied. All wires in the actuator are connected Ok. So I'm baffled. Any idea...
  4. V

    Central heating control

    The valve turns freely. I've had the actuator off.
  5. V

    Central heating control

    My cental heating system is over 20 years old. The controls are all Switchmaster - tank stat, electronic (digital) programmer and motorised three way valve. The tank stat seems to work (clicks on and off when you turn it). With the system on HW only, the tank stat determines whether the...
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