Renault Kangoo electrical fault light, and no throttle response

The vehicle revs at around 2500rpm, but no effect from throttle. It restarts if switched off and restarted, but when engine gets very hot it goes back to fault almost immediately.
The car can travel/drives in this fault mode, but there is no control from the accelerator.
Also, the fan doesnt function as before the service. This problem started same day after service done. It hardly comes on and never after parking up which it did regularly before service.
Changed throttle valve - no difference.
Fitted new temp sensor - still the same.
Finally, if engine restarted a few times from fault mode, the engine light comes on on its own, but symptoms will resume with auto gear box light eventually coming on and vehicle cuts off.