Help needed with hob fault

Billythekid · Nov 12, 2017

Just been to look at a hob that has been getting hot above the electrical / gas connections. I was unfortunately unable to locate the source of the problem.

No visible damage to cables,
Zs fine,
RCD checked out fine,
IR >999 @500v,
And is still fully operational.

I’m Baffled, any ideas?

[ElectriciansForums.net] Help needed with hob fault

Leesparkykent · Nov 12, 2017

Scrap it and get a new one.

SparkyChick · Nov 12, 2017

Did it actually get hot whilst you were there?

There looks to have been a sticker in that location... could have burned by something placed on it???

I wouldn't have thought that supply (assuming it's fused properly) would be able to deliver enough power to cause that.

Pete999 · Nov 12, 2017

Billythekid said:
Just been to look at a hob that has been getting hot above the electrical / gas connections. I was unfortunately unable to locate the source of the problem.

No visible damage to cables,
Zs fine,
RCD checked out fine,
IR >999 @500v,
And is still fully operational.

I’m Baffled, any ideas?

View attachment 39282

View attachment 39283

View attachment 39284

Heat rises, hence anything above the heat source will receive a rise in temperature and get hot, simple physics in essence.

Billythekid · Nov 12, 2017

Yeah, they are going to buy a new one anyway, but I don’t like leaving without finding the cause. No damage anywhere other than under the sticker - I have a video of my nephew pouring a little water on it - and it boiled?

SparkyChick · Nov 12, 2017

I know you probably won't be able to answer these...

With the power off did it cool down?

With the gas off did it cool down? It's more over the gas inlet... is it possible there is a leak that has been ignited and is slowly cooking the cooker from the inside???

Really grasping for ideas I know

Octopus · Nov 12, 2017

Did you take it out and inspect the connections? Looks like a classic case of a loose connection to me

Billythekid · Nov 12, 2017

No sign of thermal damage underneath. I was also clutching at straws, just as I was leaving I remembered the oven had been removed and had a metal case that could’ve been touching the gas pipe, so I checked that too - all fine.

The picture doesn’t show the mark very well, but it looks like an arc welder has been used on the casing.

I was unable to replicate the fault - I turned the gas back on, used all the hobs. Installed the oven and put that on too.

Water bonded, gas bonded - all tests were as you’d expect them to be?

Billythekid · Nov 12, 2017

SparkyChick said:
I know you probably won't be able to answer these...

With the power off did it cool down?

With the gas off did it cool down? It's more over the gas inlet... is it possible there is a leak that has been ignited and is slowly cooking the cooker from the inside???

Really grasping for ideas I know

They turned the gas and electricity off, and yes it cooled down - just cannot get it to heat up again now.

Billythekid · Nov 12, 2017

Murdoch said:
Did you take it out and inspect the connections? Looks like a classic case of a loose connection to me

Yeah, I checked underneath. I would’ve liked to have removed it but there is no isolation point for the gas.

123 · Nov 12, 2017

Murdoch said:
Did you take it out and inspect the connections? Looks like a classic case of a loose connection to me

On a gas hob really?

It looks like a burnt sticker to me. Never the less, I've never seen a loose connection burn through stainless steel from the connection block below.

telectrix · Nov 12, 2017

bloody obvious to me. it's where an alien spacecraft landed, bearing in mind that it was from a planet where the inhabitants are only 2" tall by earth standards.

Billythekid · Nov 12, 2017

123 said:
On a gas hob really?

It looks like a burnt sticker to me. Never the less, I've never seen a loose connection burn through stainless steel from the connection block below.

I’ve seen similar marks before but there has always been a logical explanation.

I was beginning to think of an external issue, but nothing else has been damaged - usually TV’s, boilers, programmers, etc are damaged too.

Billythekid · Nov 12, 2017

telectrix said:
bloody obvious to me. it's where an alien spacecraft landed, bearing in mind that it was from a planet where the inhabitants are only 2" tall by earth standards.

More plausible than anything I can think of right now.

Pete999 · Nov 12, 2017

telectrix said:
bloody obvious to me. it's where an alien spacecraft landed, bearing in mind that it was from a planet where the inhabitants are only 2" tall by earth standards.

Wrong Tel, it's a Phaser burn, probably set on Stun

Help needed with hob fault

Billythekid

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Leesparkykent

SparkyChick

Pete999

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Billythekid

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SparkyChick

Octopus

Billythekid

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Billythekid

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Billythekid

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123

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telectrix

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Billythekid

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Billythekid

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Pete999

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