On 08/12/2023 13:33, John Rumm wrote:
> On 08/12/2023 11:59, Davey wrote:
>> On 8 Dec 2023 11:25:18 GMT
>> Tim+ <timdownieuk@yahoo.co.youkay> wrote:
>>
>>> Just had to replace a CH zone valve that has probably been the cause
>>> of my CH system’s intermittency.  It looks like the motor is just too
>>> weak to push the valve switching mechanism far enough to trigger the
>>> micro-switch.
>>>
>>> Oddly, this hasn’t been happening all the time but yesterday it just
>>> stopped triggering the CH altogether.  Is this a normal failure mode
>>> for these motors? Just curious.
>>>
>>> The valve itself moves freely so there’s no resistance there. The
>>> motor just seems too weak to work against the return spring.
>>>
>>> Tim
>>>
>>
>> I noticed when I was playing with my valve recently (that sounds like a
>> Bishop and Actress joke!) that, operated manually, the valve opened, but
>> the microswitch was nowhere near being operated, so the system
>> downstream did not function. Whether this is normal, intentional, or
>> accidental, I have no idea, but it made troubleshooting more complex
>> than expected.
>
> If you operate the leaver on the side of the valve, then that does not
> usually drive it far enough to close the switch...
>
>
>
what if you operate the remainer ?

On 10/12/2023 14:39, The Natural Philosopher wrote:
> On 10/12/2023 01:32, alan_m wrote:
>> On 10/12/2023 00:47, me9 wrote:
>>
>>> I've found mid position valves unreliable, all now changed to 2 port
>>> valves.
>>> I needed to get microswitches in bulk.
>>>
>>
>> In 30 years on my CH system I've only had to replace one 3 port valve.
>>
> A lot depends on how much limescale build up you get. A good
> installation with no leaks and full of additive in a soft water area is
> fine. But when you are in a hard water area and a lot of topping up
> without additives goes on - typically because of a failed pressure
> vessel or minor weeping from some gland - you get scale build up the
> jams the valves.

I expect systems to fail more with a lack of maintenance and running
without an inhibitor.

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