Wash programme sector not working and on off switch works when it wants to

If all functions work on the other programmes it would suggest the programmer is at fault.

You can choose the right programme for any type of laundry following the descriptions on the washing programme tables (see «Washing Programmes»).
Turn the programme selector dial to the required programme. The programme selector determines the type of washing cycle (e.g. water level, drum movement, number of rinses) and the washing temperature according to the type of laundry.
The pilot light of button 8 starts blinking.
The selector dial can be turned either clockwise or anticlockwise. Position "0" to Reset programme/ Switching OFF of the machine.
At the end of the programme the selector dial must be turned to position "0", to switch the machine off.
If you turn the programme selector dial to another programme when the machine is working, the yellow pilot light of button 8 will blink 3 times and the message Err is displayed on the display to indicate a wrong selection. The machine will not perform the new selected programme.

Dado

Call a service repair shop.

Bosch WFL226 MAXX This video will show you how to change the pump washing machine
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Might be a bit complex but this is your problem and solution

REMEMBER TURN THE POWER OFF

F07: Heater relay stuck or element open circuit
This fault is only signalled when pressure switch is in empty position.
Check the efficiency of edge connector J3 on module.
Check wiring to heater and continuity of element (25 ohms approximately).
Check the efficiency of pressure switch connections and correct operation of pressure switch,
and the pressure chamber is not blocked with sludge.
Remove edge connector J3 and check wiring and contacts at positions 2, 3 and 4 on J3.
If all above OK replace pressure switch, module or eeprom as required.

Most likely a defective door switch.

Looks like you need the on/off control switch assembly.

Try Cleaning your filter under the front of the washer it probably has coins and other wonderfull stuff which can cause the clicking issue.

Regards Ed

Before switching the "on" switch select your programme, ie whether you want spin, wash, etc. Then put the "on" switch on.