Yet another Denford triac at fault!

[jamesgates1000]

I thought it probably would be the solenoid as the cylinder is fairly new. If I take off the pipe at the spindle end, no air escapes from the cylinder and carousel is pushed firmly up to spindle.

I have the machine with the built in control cabinet, solenoids are top right.

Is it this part that would need replacing?

https://uk.rs-online.com/web/p/produ...E&gclsrc=aw.ds

Or this bit...

https://uk.rs-online.com/web/p/produ...E&gclsrc=aw.ds

[m_c]

Good question. I never realised these used pilot operated valves, so it could be either part causing the problem.

I'd try swapping the pilot valves (...378 part) around first, as it could be a seal between the pilot valve and 4/2 valve body causing the problem. If the seals are ok, then you can see if the fault moves or stays.