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Vaillant 282E keeps tripping RCD at Consumer Unit?

I have a Vaillant Turbomax 283E. When I switch it on the lights on the front panel start to light up but locks out and trips the consumer unit RCD. I have replaced the PCB and checked the electrical connections are tight at all obvious connections through to wall isolator box. If it is any help. If I disconnect a lead at the pressure differential microswitch the RCD does not trip but of course the boiler does not light.

Any ideas? Thanks.

Paul
July 2008

Vaillant Heating, Home Heating Systems Tripping Consumer Switch

If you are interested, I have continued to try to find the fault. At the moment everything is working again. I think the solenoid wiring inside the solenoid casing(which I cannot remove)is faulty. I separated the wires, the earth to the left and the RH black wire to the right and everything is go. If this turns out to be a fix I will get a new solenoid.

Paul
July 2008

Thanks T,

The diagnostic lights show these to be ok, though I take note it could still be them. I have now changed the main PCB, the differential switch with micro switch. The overheat reset and now having spent over £100 it is time to get British Gas in who say they will fix it for £192. I can actually get the boiler running normally for about 30 seconds before the RCD goes again.I feel a little sick I have not been able to get to the bottom of this.

Paul
July 2008

could be the fan, pump, or gas valve solenoid causing this

T
July 2008