A different CDTi fan problem

[RayH]

Originally Posted by Jules

The PWM PCB's are susceptible to damage when removing them from the relays.
No matter how careful and gradually they are removed from the tight fitting relay terminals odd faults can occur after refitting.

My guess is that the delicate surface mount components can get cracked or a solder joint broken.

The other theory is that one of the IC's is actually static sensitive and unless full SSD procedures are carried out, the board will be damaged just by touching it


This is why we don't recommend diesel owners change the relays until a reliable source of spare PCB's is found.

The 100 or so boards I had from Longbridge have all been used up so they are like hens teeth now.

You may well be right although I went over my old board with a jewellers loupe and found nothing obvious.
Also the static damage theory would not explain why the original board failed in the first place.

Perhaps French Mike can throw some light on it when he has examined my old board. It's probably held up in some French port as we speak