hi guys, recently refurbished my pump and valve block. then had a o ring stuck under the diaphram. all now seemed to be working. rises to all hights fine, storage side is fine. here's the problem, the pump keeps cutting in and out, it runs for maybe 20 seconds in which time the front rises about an inch. the pump then stops and solenoids click and it lowers to correct hight. then it starts the cycle again. if i drop it to access, the pump stays off, no cycle. i have trolled thru the how to and faults, but i cant find a reason. any ideas please.

What happens in "high"?
Do you have the EAS software (free)? There might be a fault code logged?

Possible leak on the front....

NRV3 is leaking.