bosch double oven

[magnum]

I have an un-used Bosch double oven which has been stored for a long time, the model number is HBN9350 GB/06, it has just been installed for the first time in a totally re-wired and tested property. My problem is it trips the RCD when the lower oven is switched on but is OK with the top oven on.The lower oven is the larger of the two. My problem is the oven is out of warranty and I want to be sure that it is the oven at fault before getting in an engineer or is it the new wiring causing a problem? There is a 32 amp MCB which does not appear to trip when turning on the lower oven.

[Applianceman2010]

Re: bosch double oven

Hi , it sounds like a little moisture has got into one of the elements. What i do is remove the earth to the machine and put the oven on for 30-60mins of full heat. If this does not work the element will need replacing. Hope this helps

Please let me kn ow how you get on

[magnum]

Re: bosch double oven

Will try the earth removal, I trust this is a safe procedure? I have found today that on the lower oven it does not matter if you select the grill option in the lower oven or the full fan assisted option it trips the rcd but never the mcb. If it is just a case of ‘drying out’ the elements is it feasible to remove them and put them in the upper oven for 30 minutes.

[johnmac11]

Re: bosch double oven

Removing the earth and using the oven is not an option for any member of the public, the earth is there for a reason and should not be disconnected at any time, it might be the last thing you do :zap:

The correct way to get this oven going is to use an insulation tester to find what component is going to earth and replace it.

If you do not have an insulation tester click on the “find an engineer” link below and get a engineer out to sort this problem for you safely and correctly.

John

[magnum]

Re: bosch double oven

I have carried out the procedure as detailed by Applianceman 2010. I took due care and respected the fact that the oven was not earthed.
This was very apparent by the fact that the top oven thermostat neon indicator glowed even though it was the bottom oven that was powered up.
I went through the burn off procedure for 30 mins. on the oven and then the grill for the same length of time. The top oven neon was still glowing after 1 hour of ‘drying out’, I had little confidence it would work. Turned the oven off and isolated the board, replaced the earth and fired it all up, IT NOW WORKS!!. As of this point in time it all seems to work fine.
Huge thanks to Applianceman 2010. Do you think there will be any repercussions from A, being very slightly damp. B, carrying out the drying procedure?
Once again many thanks and yes I did take a lot of care throughout the procedure.

[Author]

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