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Old 06-03-2016, 12:50 PM   #11
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Replaced mine last year after a call to Dometic.
Make note, for those who like to boondock a lot. The units without the "Energy" switch still have a heater built into them. To disconnect the heater do not connect the plug with only 2 wires. Those wires feed constant power to the heater wires built into the fridge trim to prevent moisture buildup. Don't have a picture available, but think the 2 wires are yellow and connect to the circuit board independent of the main wire harness.
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Old 06-03-2016, 05:37 PM   #12
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Quote:
Originally Posted by Steamfitter View Post
Replaced mine last year after a call to Dometic.
Make note, for those who like to boondock a lot. The units without the "Energy" switch still have a heater built into them. To disconnect the heater do not connect the plug with only 2 wires. Those wires feed constant power to the heater wires built into the fridge trim to prevent moisture buildup. Don't have a picture available, but think the 2 wires are yellow and connect to the circuit board independent of the main wire harness.
Here's the way to disable the heater:
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File Type: pdf Refer door heater switch mod.pdf (282.7 KB, 58 views)
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Old 06-03-2016, 05:44 PM   #13
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That mod only works for switches located as per photo. My fridge model has switch and light located at middle/top front face of fridge section.
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Old 06-03-2016, 06:27 PM   #14
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Originally Posted by Steamfitter View Post
That mod only works for switches located as per photo. My fridge model has switch and light located at middle/top front face of fridge section.
Not disagreeing, as I don't know what model you have, BUT have you checked? Looking at the installation manual, most of the wiring diagrams look very similar, in that the lamp and the heater share a common connection. Although it's possible, it seems doubtful that Dometic would change something like that.
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Old 08-15-2016, 10:22 PM   #15
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I called Dometic today (574-294-2511). The woman asked for the model number, and my address, and said they would send one to me, no charge.
She was very nice, no hassle and didn't even suggest that I pay for it.
Gotta love this forum!
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Old 08-18-2016, 10:22 PM   #16
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Received the new circuit board today. Three days after I called, good service.

When I removed the old board I noticed there is a 10 watt 18 ohm ceramic resistor on the old board that is not on the new board. I think it is for the trim heater mentioned in a previous post, but I'm not sure. I think without that resistor the trim heater will be disabled. One lead from the resistor goes to the two pin plug.

I'll call Dometic tomorrow and question it.
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Old 08-18-2016, 10:30 PM   #17
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andymil:

Pull the lower access grill to your fridge. You should see a wiring diagram there. Might help. Doesn't make sense to have a resister in series with the heating element (which is basically a resister itself); they usually adjust the length/material so it works on 12VDC, no resistor.

I've attached my diagram. My door heater is item K (very bottom item on the left side, in parallel with the door switch and light). No resistor in series on mine. Of course, I don't have that circuit board, either, but I still don't think there's a resistor related to your door heater.

Maybe someone smarter will chime in.

If you figure it out, please let us all know.
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Old 08-19-2016, 01:02 AM   #18
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rockfoordroo:

Youíre right, itís not in series with the heater. I've been troubleshooting electrical systems for almost 40 years so this is not the first time I've looked at a wiring diagram. Iíve seen better. It doesn't show the light circuit board as a separate component. The plugs on the light circuit board are not shown on the print. I think my trim heater is listed as a "Heating Cable" on the print. It is in parallel with the switch and light. There is also a "LAC Heater" on the print, but the wire colors don't match anything I see. I think this is the ceramic resistor, but I'm not sure what it's for. The other lead of the resistor goes to pin 3 of the four pin plug on the light CB. It's marked LAC on the CB. Your diagram is a little different than mine.

I'll let you know if I figure it out.
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Old 08-19-2016, 09:41 AM   #19
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This particular model probably doesn't use the resistor, so they saved a nickel by leaving it off.
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Old 08-19-2016, 10:45 AM   #20
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Yeah, I just talked to Dometic and they told me that the resistor was not used on that model (DMR702) and it will work fine without it. Just wanted to be sure.
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