Disco 2 Air suspension not inflating

After wax oiling chassis air suspension will not inflate (pump not running). The air bags were fully extended at one point when I jacked under the tow bar.
Sensor linkages are OK & I have cleaned the electric plugs.
Any ideas please?

are all doors shut and is it sat on bump stops

Mouldboard said:

Sensor linkages are OK & I have cleaned the electric plugs.

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Did you disconnect the battery before disconnecting any plugs?

jamesmartin said:

are all doors shut and is it sat on bump stops

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Hi Thanks for reply. Yes just double checked all doors shut, engine running, no pump.

is it still jacked up ,fuse ok,have you tried pressing the height button they can sometimes take awhile to kick in if disturbed

brian47 said:

Did you disconnect the battery before disconnecting any plugs?

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Hi No I didn’t disconnect battery before removing plugs. Mistake?
However, problem present before I disconnected plugs.

jamesmartin said:

is it still jacked up ,fuse ok,have you tried pressing the height button they can sometimes take awhile to kick in if disturbed

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Not jacked up, it is sitting on bump stops. Have checked fuse 28 which the handbook says is air suspension but the fuse cover says is ABS! Have checked several other fuses.

Sorry James. Forgot to mention that I have tried the height button.

Mouldboard said:

Hi No I didn’t disconnect battery before removing plugs. Mistake?
However, problem present before I disconnected plugs.

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Might be, the consensus is that unless the battery is disconnected before pulling the plugs to the Ride Height Sensors, then the height calibration will be lost.
The fuse F28 is for the SLABS ECU. Self Levelling Suspension and ABS are on the same ECU.

Thank you Brian47 and Jamesmartin for all your help. I have just had another go and this time when I turned on the key the suspension warning light stayed on and the pump ran. HURRAY!!! Looks like you were right that it takes time to settle down when disturbed. Thanks again.

brian47 said:

Might be, the consensus is that unless the battery is disconnected before pulling the plugs to the Ride Height Sensors, then the height calibration will be lost.
The fuse F28 is for the SLABS ECU. Self Levelling Suspension and ABS are on the same ECU.

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i regulary change sensors with battery connected, i havent lost the calibration yet ,though one se of sensors i fitted were faulty and vehicle sat odd, fitted 2 new ones and back to normal