Rover 45 - MG ZS ATC Climate Control Repairs

I can repair all faults associated with the LCD Climate Controller and the electronic Fan controller.

The most common item to fail is the electronic fan controller, officially called "PWM Transistor Pack" but usually referred to as a "Hedgehog".


The original MG-Rover part number for this item is JGN000010, this is no longer available as a new spare part.


The module was manufactured by an Italian company called Bitron for Delphi Diavia, the original part number is 133000/3 CEV/5.


This repair also applies to the same module fitted to some Ferrari models, 360, 430, F430, 456, 550, 575 and ENZO. The Ferrari part number is 064280200.


The usual faults include;

  • Fan running at full speed.
  • Fan running slowly.
  • No fan operation - unit dead.
  • Limited range of fan speed.


The fixed repair charge covers the "stock faults" that this module suffers from, the module must be intact and not damaged. Return delivery is included, via Royal Mail Special Delivery for UK customers and International Signed For for customers outside of the UK.


I replace a number of components to increase reliability, extra protection is added and the two power MOSFET transistors are replaced with uprated components designed for motor drive applications rather than the standard IRFZ44N transistors that were originally fitted.



Please be aware that the usual reason for failure of the PWM Module is a faulty fan motor which is either drawing excessive current (siezed bearings) or is generating electrical spikes (worn brushes). The fan motor fault MUST be rectified before refitting a repaired module!


Modules sent for repair that are found to have a poorly carried out previous repair or have been damaged by water ingress are not covered by the fixed repair charge and these will incur higher repair charges.


You need to remove the faulty module and send it to me, I do not have this item for sale.






UK Customers - PWM Controller Repair - £35.00

Mainland EU Customers - PWM Controller Repair - £40.00

If you have a fault with the LCD Controller please contact me for advice and repair costs.


The controller part number is JFC001320.


Paul Brown


Technozen Electronics

44 Meadowview  

East Sussex





07527 877995



Website Last Updated:


 August 2021.






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