I have an odd continuing problem with the EAS on the HSK.
The system works flawlessly, however, the compressor cycles on and off frequently.
Sometimes it is as little as a few seconds, sometimes it is on for minutes.
Nano reports that the compressor is indeed being commanded to switch on and off each time it does so.
Pressure switch remains at "Open" status and thermal switch reports as "Normal"
This condition persists whether it is first thing in the morning and all is cold, or after a long hot drive. Same behavior
Any ideas?
I have ordered a pump rebuild kit just in case, but I believe the compressor is fine.
Have a spare pressure switch as well, but as Nano reports that the switch state is unchanged, yet
commands the compressor on and off, I don't see that as probable cause..
I am baffled.

I believe I have this one solved.
I got a couple of pump kits and rebuilt and tested my 2 spares.
Put one in the HSK, and had the same issue.
Using a clamp on ammeter, I was watching the running current to be sure it was coming up to pressure
by observing current rise over time, and saw some odd dips in the current just before it would do a short cycle.
Turned out to be the relay, which in a bench test was heating up very slightly, and the contacts were
opening, cooling, and closing.
So, new relay, and all good!..................For now..............

Oh wow, good news!

Hmm, sounds like a routine maintenance job will be whacking one of these in https://www.autoelectricsupplies.co.uk/product/169/category/36

Cheap enough to add one to my order next time I put in an order. I've already got a pair of those powering the heater blowers.