Electrical help please

[Figaro]

I bought a used dometic air con unit (B2200) off a funster and decided to bench test it before doing anything.
The electrical connections are simple enough, block connector to face plate in hab area and live neutral and earth which I fitted a 13 amp plug to. Plugged into extension lead ....... pop. !!!!! Bugger.
A fuse on the PCB has blown and I hope it protected it sufficiently to prevent damage.
For the life of me I can't see where I've gone wrong, all connections good.
Am I missing anything obvious ?
Any ideas where to go from here ?
I don't think I have a correct fuse to replace the blown one so can't do anything today.
The unit was tested, found working and removed by sellers dealer and sold in good faith so I've no problem with seller.
If junk and not repairable, I'll just put it down to experience, but seems a stranger one.
The problem I'd expected, if any, was going to be fan working but no cooling.
Any help / suggestions please ?

 

[Silver-Fox]

Should it be running off 12v

Only guessing here.

 

[Figaro]

I don't think they run off 12volt do they, the blown fuse is 250v 10a

 

[Andacami]

Dometic B2200 Air Conditioner RV Electrolux aircon caravan and motorhome air conditioning unit UK

Dometic B2200 rv air conditioner for use in caravans and motorhomes UK

www.caravanfridges.co.uk

 

[Stealaway]

I could - Have you seen a voltage/amps plate on it anywhere?

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[M-J]

Doesn’t it have to have some sort of dc kit to run anything but 12v?

 

[Silver-Fox]

I don't think they run off 12volt do they, the blown fuse is 250v 10a

I honestly don’t have a clue, was just a guess.

 

[Figaro]

Says 230v

 

[Figaro]

I'll go check all the wiring - again

 

[M-J]

https://manualsbrain.com/en/manuals/1070674/

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[Sheddy]

The supply is 230v only, they can be run from a 6amp hookup, if nothing else is switched on.
By blowing the 10amp fuse, it would suggest a problem within the unit.
Cheers
Ed

 

[ambulancekidd]

Only the newer ones can run on 12v & they cost a fortune.
I'd slip the cover off the main unit to see if there's a short circuit anywhere & also test the main wire to the unit, it may have become damaged en-route to you.

Oh & edit, make sure the heating element is switched off before you try it again.

 

[Figaro]

Ok, looked at PCB and seen this, could it be damage, one of those connections goes directly to the main fuse.

 

[Figaro]

Could this damage by my problem ???

 

[Vipar]

Could be tracking across the dust

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[Jev88]

Could this damage by my problem ???

Amy mark like that on a PCB means something isn't right? Looks like a track overheated?

 

[Figaro]

Can it be repaired ?

 

[Jev88]

Can it be repaired ?

Yes, often. But needs someone with electronics skills. They can reinstate the track and test at component level.

 

[Richard n Ann]

Varistors sometimes go short on circuit boards and cause this fault. They are a protection device for transient voltage spikes. Once triggered they go short and need removing. The varistor will appear blackened and maybe cracked, but here's what they should look like...

Varistor - Wikipedia

en.m.wikipedia.org

 

[Campervan_man]

You need to be running it off 2.5MM hook up size cable, check you are not using smaller cable

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[Two on Tour]

You need to be running it off 2.5MM hook up size cable, check you are not using smaller cable

How's that going to blow a fuse on the PCB then ?

 

[Figaro]

I don't see anything resembling a varistor.
Suspect damage in top RH corner

Would the guys that refurb electroblok be able to inspect / repair. Is it aplujack and / or a and a caravans ???
Or anyone else ?
I know a guy that repairs PCB on games machines but not sure if he could do this.

 

[tonyidle]

That is the PCB vapourised by an overload. it may have gone at the same time as the fuse. If you're up to it look at the first component connected from that track. You might get lucky & find something damaged.

 

[Campervan_man]

Some people fit any old cable that is lying around instead of reading and following instructions. Just gave some free and friendly advice to another Funster.

 

[lunarman]

Can it be repaired ?

you could give these guys a ring apuljack

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[hilldweller]

That pcb damage makes no sense. The only way I can see it happening is if those tracks rubbed on something metallic.

 

[tacr2man]

Is that a transformer ring , where it has blown the printed track ?

 

[Figaro]

That is the PCB vapourised by an overload. it may have gone at the same time as the fuse. If you're up to it look at the first component connected from that track. You might get lucky & find something damaged.

There were two pops when I plugged in ... .... eek
What might cause an overload ?
To be fair I did use a bit of cable laying around and not 2.5mm but it looks ok.
That damage is between the live and neutral with the fuse in between, and both go to the copper coil.
Thanks for help tonyidle , does it look repairable or toast ?
I'll email apuljack tomorrow.

 

[Speve]

In the first photo it looks like a water stain on the pcb that would have shorted it wouldn’t it??

 

[Figaro]

Nothing near it to rub against it

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