truma c4002 fault

[Spade]

Hi all. I need your help again.
I have the truma c4002 blown air heater in the van.
it was working fine but now it shows the red fault light as soon as I switch it on.
No fan noise,no clicking sound...nothing.
There is power and gas supply is good.
I have searched on line and the only thing that I could see was an article showing a full stripdown.
One of the photos in the article shows a grubscrew in the top of the pcb board but my pcb boards one is missing.
the grubscrew seems to make an connection on the pcb board
Could that be it, or any other ideas

 

[Boringfrog]

Does it heat the water if turned onto water only?

 

[Spade]

No.fault light comes on as soon as you flick the switch in either mode

 

[sdc77]

There are two small glass fuses on the pcb. You could check those

 

[Spade]

I checked the fuses and they look ok

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[sdc77]

If all else fails it may be worth calling Truma tech support in Burton ..
01283586020

I have always found them to be very good.