Peugeot 206 central locking problem

hi i have seen threads about this before but wondered if anybody knows
how to sort it out , as soon as i press the lock button on the remote
the doors and boot lock but immediately unlock , i have tried
disconnecting each solenoid in turn and loads of WD40 but it still
does it , the only way i can lock my car is to unplug the door
solenoids and lock them manually , if i leave the solenoids plugged in
and lock the doors manually they still unlock , has anybody got any
ideas , thanks .

 

The locks contain a contact to indicate to the central locking system that a
door is not latched ie. open.
Either this contact has failed or you have a wiring fault.
A cure is often to slam each door in turn and try to central lock, you will
eventually see which door or the boot is causing the problem
Mike