Lincat ESLR9 electric cooker went bang

[jgaircraft]

Hi all,

To give a bit of background, it is a Lincat ESLR9 electric cooker. It is very simple design with two fans and two elements for the oven. See attachments 1 and 2 for the manual and parts list. The parts list says it could have 2kw or 3 kw heating elements, my oven has two 3kw elements fitted.

Two weeks ago the cooker made a bang and tripped the consumer unit, upon inspection I could see that the contactor appeared burnt-out and a wire on a heating element was loose and burnt also, with signs of arcing on the connector. The contactor fitted was a IMO MB09-F-00, see attachments 3,4 and 5.

I replaced the contactor with this unit from Ebay:

https://www.ebay.co.uk/itm/14273079...5338980112&toolid=10001&customid=kWjPkVABeRQJ

and replaced the heating element and replaced the female spade end connector, see attachments 6 and 7.

Unfortunately the replacement contactor has burnt-out also, even though it is the part number stated in the manual and the oven is listed in the advert, perhaps it isn't the correct part?

My theory is the poor connection method of the replacement contactor? The original (IMO unit) had sturdy spade end connectors for good contact, the replacement, feeble little spring type terminals where the wire is shoved in and held loosely by a weak clamp (felt loose and could pull the wire out easily).

I'm thinking this might be causing high resistance/heat and hence overcurrent, but I'm not an electrical engineer and I might be overlooking something else.

Thank you for read my post!

Regards

James

 

[flameport]

the replacement, feeble little spring type terminals where the wire is shoved in and held loosely by a weak clamp (felt loose and could pull the wire out easily).

Either the wires have been installed incorrectly or into the wrong hole, or the wires are not suitable for that type of connector.
It should be pretty much impossible to pull wires out of those without destroying the connector or the wires.

That also assumes the part is actually genuine, and not some knockoff fake piece.