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Old 07-07-2019, 03:59 PM   #1
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Dometic 2652 control board diagnostics help please.

Trying to determine if my fridge control board is bad or not.
13 year old Dometic RM2652.

Replaced the cooling coils and heater element about 6 years ago.

Works perfect on propane.
No joy on ac.

First thought was bad electric element. Tested fine. 43 ohms.

Had a blown 5amp fuse. Replaced it.

Checked for 120v. At the 5amp fuse.
With one probe to ground, I get 120v on the input side of the fuse, but zero volts on the output side.

I am pretty sure it's the board.

Any help to help me verify if it is the board?

Thanks,
Bill
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Old 07-07-2019, 05:19 PM   #2
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Just a thought. I assume when you go to AC you also have DC.
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Old 07-07-2019, 05:35 PM   #3
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Ok folks, nevermind. I have no idea what I did when I tested electric element. Decided to test again and it reads open. Bad element. Ordered a replacement that will be here Tues.

Old element has been removed. See pics.

Will let you know then.

Thanks,
BillClick image for larger version

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Old 07-07-2019, 05:47 PM   #4
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Make sure that the heater element is not shorting to ground. Resistance to ground should be in meg ohm range I think.

Check oxidation at the fuse holder.

I would think you would have 115 on both sides of the fuse it the fuse is good. Maybe the element is shorting to ground and blowing the fuse.

I would think since the board is suppling 120 to the fuse the boards good.

My bet is heater to ground short or low resistance
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Old 07-07-2019, 06:55 PM   #5
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Yes. Heater read open with ohm meter.
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Old 07-09-2019, 08:45 PM   #6
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Back together and working
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