hi
I need help with a problem in air conditioning

Model: Seat Toledo 1.9 TDI
Year: 2000
Engine: AHF
Error Code: 00792 - A/C Pressure Switch (F129)

Description:
compressor gives the signal to work, but turns off immediately. stops and starts for a minute and then the system shuts down. the fan does not work, but I think it will work only after the compressor in operation. the system has no leakage and it loaded with 750gr. replacing the switch, but the problem continues.

any idea to solve the problem?

Thanks for any help