I have a 220 cdi Mercedes, sometimes when ignition is switched on aircon, windows, gages on cluster and radio does not work. When I switch it off or drive a few km then fine.What could the problem be?

I'd have to check voltage and ground for the instrument cluster. I noticed one of the fuses for your instrument cluster goes hot with the key on, same thing for ac compressor. I'd have to voltage feed to and from ignition switch for applicable fuse. Check the ignition switch wiring connector. I can't rule out ignition switch itself, at the moment.
There could be other issues?
Ignition switch faults are common on some makes and models.
Instrument cluster wiring connector problems. Sometimes if you disconnect and reconnect the instrument cluster connector, it may start working again, also, cycling the instrument cluster connector may reset, if it starts working, well, it's working for now, may quit again.
Some instrument clusters may do a self test, don't know about yours?
Press and hold odometer reset button, turn key to run position release odometer reset button, watch the odometer. Your indicator lamps may turn on and off, the gages may cycle in small increments. The cluster will exit self test on its own.
You may have to check buss circuits.

it sound like a relay for the windows have gone should be in the fuse box this should be if right hand drive but should be the same if left open bonet as you look in it will at the top left hand side of the engine black box take off the cover all fuses and relays are numbers just pull the one out for the windows also check fuses as well another possibility could be the window switch cluster around gear stick but this is unlikely hope this helps ivan

I would go with an ignition switch if i had to guess, the switch is located at the bottom top of the steering column shaft and is operated by a steel rod from the ignition lock cylinder. Ford has had many problems with these switches over the years, but this year is far better than older designs.

Switch on ignition. Cycle left steering wheel buttons till mileage and trip are displayed. Press reset button ( left corner of instrument cluster ) for 3 seconds until reset message appears, release and press again within a few seconds and confirmation will appear on dash. switch off ignition.

Switch ignition on
Press trip counter button twice
Switch ignition off
Press and hold trip button while switching ignition on
After 10 seconds new service interval will be displayed +beep
Release trip button
Switch ignition off

Fuse on back of gage cluster, and the dimmer switch on the gage cluster.

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Remove a switch that works and put it in place of the faulty one, if it works ...then you know it will take a new switch.

This is a common problem, but I've never seen a window regulator go bad in a Mercedes, the problem is probably the switch, you can check his by removing both working and nonworking window switches from the console, and plug in the other side or rear to roll the windows up/down,you will need to disassemble the switch that does not work and clean it well then, it will work again I've done it to my Mercedes

This system does not work like a conventional system. i have seen this problem many times and it has alwya been theblinker switch input. replace the blinker switch.