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Burned Out Heater Relay - Bosch DW SHE44C05UC/40


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5 replies to this topic

#1 splice

splice

    Unsui

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Posted 28 February 2011 - 10:11 PM

Traced an E1 (failing heater) error code to the Control Module. Popped it open and found that the pin out of the heater relay had arced and disintegrated back into the relay body. PCB looks OK but the relay is toast. Not enough material to re-solder the pin. Can't find the 6VDC version of the relay on the net. A post on a different forum stated that the manufacturer (Song Chuan) does not sell the 6VDC version in the US. Could only find 12VDC and 24VDC versions.

So I have a couple of questions:
  • You sell the replacement control module. Does your replacement unit have any engineering changes to prevent this from happening again. The heater draws 10A which is the maximum rating on the relay. Whatever happened to the 80% design rule?
  • I read somewhere else on this forum that there was a recall to replace the CM due to potential fire hazard. There is nothing on the Bosch Appliance website about this. I will call tomorrow. Do you have any further information?
Thanks for a great website.

Splice

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#2 kdog

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Posted 28 February 2011 - 11:08 PM

Read this: http://appliantology...113#entry188113

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#3 RegUS_PatOff

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Posted 01 March 2011 - 04:29 AM

Can't find the 6VDC version of the relay on the net.

what are the part numbers on the Relay ?

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#4 splice

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    Unsui

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Posted 01 March 2011 - 07:48 AM

The relay manufacturer and part number is: Song Chuan 899-1C-F-C 6VDC coil.

Splice

#5 splice

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    Unsui

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Posted 04 March 2011 - 05:49 PM

Found a replacement relay at Newark Eelctronics. Newark part number: 81C8194. Price $4.69 each. NTE part number: R46-5D12-6. Contact rating is 12A@120VAC which is two more than the original. It is pin for pin compatible and works perfectly. The measured amperage draw from the heater is 9.5A.



Newark reference: http://www.newark.co...jsp?SKU=81C8194

#6 kdog

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Posted 04 March 2011 - 06:31 PM

Thanks for posting the outcome !!

:woohoo:

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