Vauxhall Corsa can't turn temperature selctor dial to hot

Never done one but must be the cable or motor whichever operates the heater control valve / flap faulty . This shows a #27 fuse for heater shut off valve , you could check / pull fuse and refit .

2016, 2017
Engine compartment
Under-hood fuse box diagram: Opel/Vauxhall Corsa E (2016, 2017)

Assignment of the fuses in the engine compartment (2016, 2017)
№ Circuit
1 Trailer interface module, rear carrier system
2 -
3 Battery sensor
4 Chassis control module fuel pump
5 ABS
6 Low beam and Daytime running light left, Xenon high beam shutter left and right
7 -
8 MTA Transmission control module, LPG control module
9 Body control module voltage detection
10 Headlamp levelling
11 Rear wiper
12 Rear window defog
13 Low beam and Daytime running light right
14 Heated exterior mirror
15 -
16 Brake booster kit
17 Ignition, crank power supply
18 Engine control module
19 Fuel pump
20 -
21 Engine Solenoids, engine sensors
22 -
23 Injection system
24 Washer system
25 -
26 Engine sensors
27 Heater shut off valve
28 Engine control module
29 Engine control module
30 Engine control module
31 High beam left, Xenon low beam left
32 High beam right, Xenon low beam right
33 Engine control module
34 Horn
35 Air condition compressor clutch
36 Front fog lights
Under-hood fuse box diagram: Opel/Vauxhall Corsa E (2016, 2017)

Assignment of the fuses in the engine compartment (2016, 2017)
№ Circuit
1 ABS pump
2 Front wiper
3 Blower
4 Instrument panel
5 -
6 Diesel fuel heater
7 Transmission
8 Cooling fan low
9 Cooling fan high
10 Cooling fan
11 Starter
Instrument panel
Instrument panel fuse box diagram: Opel/Vauxhall Corsa E (2016, 2017)

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Assignment of the fuses in the Instrument panel (2016, 2017)
№ Circuit
1 -
2 -
3 Power windows
4 Voltage transformer
5 Body control module 1
6 Body control module 2
7 Body control module 3
8 Body control module 4
9 Body control module 5
10 Body control module 6
11 Body control module 7
12 Body control module 8
13 -
14 Tailgate
15 Airbag system
16 Data link connection
17 Ignition
18 Air conditioning system
19 Sunroof
20 Parking assist/Rain sensor/Front camera
21 Brake switch
22 Audio system
23 Display
24 -
25 Auxiliary jack
26 Instrument panel
27 Seat heating, driver
28 -
29 -
30 Instrument panel/Seat heating/ FlexDock
31 Horn
32 Seat heating, passenger
33 -
34 Heated steering wheel
35 Tyre repair kit
36 -
37 Rear wiper
38 Cigarette lighter
39 Power windows/Sunroof/Automatik transmission display
40 -

Thanks for that reply but the problem is the mechanical knob that switches from cold to hot, etc

That seems to be a common fault with the control panel as plenty new and used on e bay for sale