Have you tried running the ATC diagnostics? Procedure as follows:
A manual diagnostic check includes a check of the sunlight sensor, and is initiated by pressing and holding the AUTO switch and the air distribution switch, then turning the ignition switch from 0 to II. The audible warning and all the indications on the control panel display cycle on and off while the ATC ECU runs the diagnostic check. When the check is completed, all the indications on the display are replaced by FC in the LH temperature window and a two digit fault code in the RH temperature window. If there are no faults, the system then reverts to normal operation. If a fault is detected, the audible warning sounds three times and the fault codes cycle on and off in numerical order, at 1 Hz. The audible warning sounds as each fault code is shown. The check is cancelled by pressing the OFF switch or turning the ignition switch to 0. In low light conditions, to avoid false sunlight sensor fault indications, the sunlight sensor should be illuminated with a strong light source.
Diagnostic fault codes and fault descriptions
Code - Component - Fault - Default value/strategy
00 - No fault found
11 - In-car temperature sensor - Open or short circuit - 25 °C (77 °F)
12 - K bus - Fault with ambient temperature input - 10 °C (52 °F)
13 - Evaporator sensor - Open or short circuit - 5 °C (41 °F)
14 - Heater coolant temperature sensor - Open or short circuit - 70 °C (158 °F)
21 - Sunlight sensor, left output - Open or short circuit - No solar heating correction
22 - Sunlight sensor, right output - Open or short circuit - No solar heating correction
31 - LH temperature servo motor - Open or short circuit - Motor or flap mechanism seized Servo motor locked in position.
32 - RH temperature servo motor - Open or short circuit - Motor or flap mechanism seized Servo motor locked in position.
33 - Distribution servo motor - Open or short circuit - Motor or flap mechanism seized Servo motor locked in position.
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Rover 75 1.8T Contemporary SE Auto
Starlight Silver MBB
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