Hotpoint WMA63 Chopper board resistor failure

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SaintM

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• 19 Feb 2011

• #1

The chopper board on my WMA63 has two resistors burnt out, On the board they are labelled R10 and R11 The R10 is on the edge next to the 7 pin connector, while the R11 is under the heat sink, next to the large blue rectangular capacitor. Can anyone please tell me the size of each resistor.
Thanks

 

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Mickymoody

• 19 Feb 2011

• #2

Are they burnt beyond recognision, or can you give the colour codes off them? I suppose if two resistors are burnt out, then maybe a transistor failed too?? Sounds like a major fail.

 

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SaintM

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• 19 Feb 2011

• #3

Sorry I didn't mention that I had already found the wires between the board and the motor exposed and so causing a short. But I have no idea what the size of the resistors on the board are. They are now both burnt and open circuit.

 

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Mickymoody

• 20 Feb 2011

• #4

SaintM said:

Sorry I didn't mention that I had already found the wires between the board and the motor exposed and so causing a short. But I have no idea what the size of the resistors on the board are. They are now both burnt and open circuit.

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Mine too recently, the top plate had become detached, and burnt through the wires to the heating element. But I didn't see any shorted resistors. (and it seemed to still work!); can you contact Hotpoint and ask what the resistors are? I took a chance with RM, and Midland, and they gave me specific information on repair, always worth a chance? There are forums that specialise on this info, but many you have to subscribe to. I once bought a service manual for a monitor, only for the day after my son knocked the tube base off it..£40 down the drain. I sold the manual too.

 

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SaintM

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• 21 Feb 2011

• #5

Found elsewhere on the net that the R11, seems to be 10 ohms, the R10 was reading 8.5 ohms, so I took a chance and replaced both with 10 ohms. I then ran the machine once, it seemed fine. It's since been running almost constantly, catching up with the massive backlog of dirty clothes.

 

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Mickymoody

• 23 Feb 2011

• #6

SaintM said:

Found elsewhere on the net that the R11, seems to be 10 ohms, the R10 was reading 8.5 ohms, so I took a chance and replaced both with 10 ohms. I then ran the machine once, it seemed fine. It's since been running almost constantly, catching up with the massive backlog of dirty clothes.

Click to expand...

10 ohms in a chopper circuit sounds very dubious, thats almost like a short circuit, especially as domestic appliance resistors have a tolerance of 5-10% threshold. I take it you measured them out of circuit, as earlier you said they were o/c? Maybe the ESR of the cap you mentioned is out of tolerance, maybe look to replace it in future, or there was a dry joint? but as it's working again whoo hoo!!!