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timmmay

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#277038 23-Sep-2020 07:19
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We've been having a weird issue with our electric toothbrushes recently. They've worked fine for a couple of years but have recently started failing.

 

Our two Oral B toothbrushes on two separate chargers ran out of power recently, slowly running down. They were on their chargers which were plugged in and hadn't been moved. I sent my toothbrush away as it was under warranty. They send it back, toothbrush is fine, but gave us a new charger. My wife bought a new toothbrush, which isn't working right. For some reason the toothbrushes won't charge on the mains plugs in the bathroom cabinet. They charge fine in the kitchen, and things like hair driers and other things work fine from those mains plugs.

 

The only thing that's changed recently is that we had a new circuit put into our house for the dishwasher, as there was a fault on the old circuit. The new circuit connects to the existing RCD that otherwise only powers the bathroom, as the bathroom was redone about 10 years ago and was done to the standards of the time. (Aside - the rest of the house doesn't have an RCD, bit old, we're planning on redoing the circuit board at some point to modernise at some point).

 

Is there any way the toothbrushes chargers failing / not charging could be related to a new circuit being connected to the existing RCD?

 

Of course I will call the electrician to ask them to have a look, but the wisdom of Geekzone might have some ideas for what could be an unusual problem that could stump an individual electrician.


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surfisup1000
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  #2572481 23-Sep-2020 07:29
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Get your electrician who installed the new circuit to fix this . Sounds like they might have stuffed something up.  If so, it is a free job, if not, you have to pay the cost I guess. 


timmmay

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  #2572483 23-Sep-2020 07:38
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surfisup1000:

 

Get your electrician who installed the new circuit to fix this . Sounds like they might have stuffed something up.  If so, it is a free job, if not, you have to pay the cost I guess. 

 

 

I will, but I wanted to see if anyone here had any bright ideas first. The electrican could (but probably won't) say "we didn't cause it", if I can say "have you considered xyz" it might help.


 
 
 
 


k1w1k1d
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  #2572484 23-Sep-2020 07:39
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That's a weird one!

 

An RCD can't cause that issue, it just disconnects the power if it detects a current imbalance between the phase and neutral wires.

 

We have a couple of Oral B's that have been running off an RCD plug for years without issues.

 

I assume that all the devices that work on the suspect plug have only two pins like the chargers?

 

Have you tried using a double adapter between the plug and chargers?


timmmay

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  #2572487 23-Sep-2020 07:51
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Yes they're two pin chargers. What would a double adapter do? We have two double outlets under our sink, each toothbrush is plugged into a different outlet.


Bung
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  #2572491 23-Sep-2020 08:01
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You say hairdryers and other things work fine. Have you compared how they operate in the bathroom and another location? Do you have an ordinary lamp that you could compare brightness in bathroom and other sockets?

Adding the dishwasher circuit to the RCD would have disturbed the bathroom connection. Maybe it now has a high resistance that affects the toothbrush charger which is already a low current device (0.9w) more.

timmmay

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  #2572494 23-Sep-2020 08:11
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Bung: You say hairdryers and other things work fine. Have you compared how they operate in the bathroom and another location? Do you have an ordinary lamp that you could compare brightness in bathroom and other sockets?

Adding the dishwasher circuit to the RCD would have disturbed the bathroom connection. Maybe it now has a high resistance that affects the toothbrush charger which is already a low current device (0.9w) more.

 

We haven't tried any low current devices. I have a LED lamp that's about 1-3W, I'll give that a go, along with a small range of devices.

 

Thanks for the ideas. I don't want to bother the electrician if this is nothing to do with them.


Gordy7
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  #2572505 23-Sep-2020 08:34
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Some modern appliances have an insulated region on the plug pins.

 

Maybe older mains sockets do not make contact properly with the tip of the plug pin.

 

 





Gordy

 

My first ever network connection was a 1MHz AM crystal(OA91) radio receiver.


 
 
 
 


surfisup1000
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  #2572513 23-Sep-2020 08:50
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timmmay:

 

surfisup1000:

 

Get your electrician who installed the new circuit to fix this . Sounds like they might have stuffed something up.  If so, it is a free job, if not, you have to pay the cost I guess. 

 

 

I will, but I wanted to see if anyone here had any bright ideas first. The electrican could (but probably won't) say "we didn't cause it", if I can say "have you considered xyz" it might help.

 

 

Ha, it just sounded too weird to me.  

 

I guess a circuit test might highlight the issue. The electrician who wired our house failed to test some circuits yet self signed the code of compliance.  We suffered the consequences of his shoddy work for some time, before spending $2500 to get the problem fixed!

 

 

 

 


timmmay

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  #2572625 23-Sep-2020 10:39
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Gordy7:

 

Some modern appliances have an insulated region on the plug pins.

 

Maybe older mains sockets do not make contact properly with the tip of the plug pin.

 

 

Thanks. Both sockets are modern, so probably not that.


webwat
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  #2573113 23-Sep-2020 22:30
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timmmay:

 

surfisup1000:

 

Get your electrician who installed the new circuit to fix this . Sounds like they might have stuffed something up.  If so, it is a free job, if not, you have to pay the cost I guess. 

 

 

I will, but I wanted to see if anyone here had any bright ideas first. The electrican could (but probably won't) say "we didn't cause it", if I can say "have you considered xyz" it might help.

 

 

If there was any problem with the dishwasher circuit that could possibly affect bathroom it should have tripped the RCD...





Time to find a new industry!


mclean
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  #2573259 24-Sep-2020 09:30
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Are they magnetic chargers?  Is there an indicator light on the charger when it's charging?





McLean


timmmay

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  #2573261 24-Sep-2020 09:32
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mclean:

 

Are they magnetic chargers?  Is there an indicator light on the charger when it's charging?

 

 

Induction chargers. The fancy new toothbrush my wife uses has a light on when it's charging, which does go on. The cheap one I use doesn't.

 

I'm just validating the fault now. My wife has observed it but I haven't yet. Everything else I've tried works, from 1W LED lights to hair driers. I'm letting the toothbrushes run down, then I'll plug them in to let them charge.


mclean
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  #2573263 24-Sep-2020 09:40
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Check there's nothing metal near the chargers.  If you're charging both at once, keep them well apart.  Make sure the brushes are switched off when you start charging.





McLean


neb

neb
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  #2573469 24-Sep-2020 13:00
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timmmay:

I will, but I wanted to see if anyone here had any bright ideas first. The electrican could (but probably won't) say "we didn't cause it", if I can say "have you considered xyz" it might help.

 

 

You could try one of those cheapie plugin checkers that test for common errors like active/neutral reversal and so on, as well as testing RCD trip currents, it'll exclude the most common faults. You can get a crappy Deta tester, without the RCD functionality, from any Bunnings for $12.95.

timmmay

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  #2573492 24-Sep-2020 13:26
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Nah if I think there's an actual fault I'll call the electrician. I'll just give it a few days to run the toothbrushes down, double check if they charge there, then if they don't I'll try another plug.


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