Sounds like a solenoid fault - the clifford instructs the solenoid to throw for either .8 of a second or 1.5 seconds (or numbers close to that). When the locks are in good condition (ie, new, greased etc) the 0.8 second throw of the solenoid is enough to lock the door. As the car ages, the solenoid needs to "try harder". Setting the clifford to throw for longer is another option - done via cliffnet wizard (installer edition only though iirc)
It could also be a bent rod from the solenoid to the door lock (will be drivers side door).
Check the lock mechanism is greased up (take door card off, grease everything that moves - use white aerosol grease).
Quote:
Originally Posted by elliotthorwood
But when I dont use the remote central locking and lock it with the key it's faultless :/
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It would be - your turning force with the key is much stronger than the force of the solenoid. That's why I think it's the solenoid at fault, or a bent rod.