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Samsung RB215LASH defrost issue


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10 replies to this topic

#1 scooterb13

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Posted 11 June 2013 - 02:15 PM

I am working on a Samsung RB215LASH refrig. that had frosting issues in freezer section. Traced out problem to an open thermal fuse, replaced fuse and then the defrost heater would stay on even when compressor is running. Replaced main board but still have 120v. to heater when compressor is running. Checked for grounded heater, but it's ok. Does anybody have any ideas?



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#2 Samurai Appliance Repair Man

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Posted 12 June 2013 - 07:16 AM

Where are you measuring that voltage?  CN70, 13-7 on the main PCB?



#3 scooterb13

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Posted 12 June 2013 - 12:26 PM

I checked the voltage at the heater harness plug in the freezer w/ the heater unplugged (brown to red wire at thermal fuse). I didn't check directly at the board terminals.



#4 RegUS_PatOff

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Posted 12 June 2013 - 12:32 PM

... w/ the heater unplugged

all voltage measurements should be made with the devices connected

unless otherwise directed


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#5 scooterb13

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Posted 12 June 2013 - 03:17 PM

120v. with the heater connected or not connected, the heater on when it is connected, even when the compressor is running.

#6 Spannerwrench

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Posted 12 June 2013 - 04:01 PM

Sounds like a shorted heater relay on the main board. That's what caused the thermal fuse to open. The fuse did it's job, to protect the liner.

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#7 scooterb13

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Posted 12 June 2013 - 06:54 PM

That's what I thought, so I replaced the main board & no difference. Very strange one. I just got a call from the customer and they decided to get a new (non Samsung) refrig. so I told them I would take Samsung and bring it to the shop and get to the bottom of this.

#8 RegUS_PatOff

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Posted 12 June 2013 - 07:41 PM

... so I replaced the main board & no difference.

new ?


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#9 scooterb13

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Posted 12 June 2013 - 08:42 PM

Brand new exact Samsung part.

#10 RegUS_PatOff

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Posted 12 June 2013 - 09:03 PM

If the Compressor and Defrost are on at the same time,

it would seem to be a bad Controller Board


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#11 scooterb13

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Posted 12 June 2013 - 09:22 PM

That's what it seems it would be, maybe I got a defective new board. I will be checking it again tomorrow at the pins on the board and post what I find. Thanks




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