Hydractive suspension not risong when engine started

[Tommythegreek1977]

Hi guys and ladies!
New to the forum and just need to state what a wonderful job you re all doing here - bravo! If anyone can help with my Gremlins:?:
Citroen 2.2hdi estate yr2002 the suspension won't rise when the engine is running. It will get lower, but wont rise. When i turn the engine off, and switching on the ignition again, the pump comes on and the requested height is obtained, whatever that might be. The problem is that when the engine is running, the suspension will not adjust upwards - lets say someone sits at the back for instance, it wont pump up itself again. If one steps out of thecar, it will adjust back down.. lexia gives no faults on the suspension, all spheres are checked and not leaking, fuses checked, connectors to the pump, and all in the enginebay fuse box cleaned and checked. Any ideas??

[GiveMeABreak]

Very likely to be either the rear height corrector or the rear centre sphere hydraulic block.

[Tommythegreek1977]

Tnx for the quick response - any way to test these two, or am I just swaping and see what works?