Just been having a fiddle.
Fuses all okay. Rely okay. Connector in pump box all good. No signs of corrosion anywhere. Car is a good clean example.
Car still on access height. Started car up. Pump not running at all. After a few minutes, I checked the Nanocom and it says rear valves open and then after another few minutes rear rises up. Pump still not running. Checking Nanocom and rear valves close, front valves open and after several more minutes the front rises and now car is at the standard height. Pump hasn’t run at all during that time and still isn’t.
Left car for a bit. Switched to high level. Car tries to rise and gets about 3/4 the way there with pump still not running.
Fiddled about a bit more in no particular order and pump started running for awhile without doing anything specific.
I really am confused!