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My Dometic RM 3663 will start in ac mode, but soon switches to dc mode. What causes that?

When my motorhome is plugged into 30 amp, I can click on Auto and the refrig will start in ac mode. But shortly thereafter it will switch to dc mode. What causes that?

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  • Refrigerators Master
  • 9,472 Answers

Check the fuses

Posted on Dec 08, 2012

5 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

  • 36 Answers

SOURCE: dometic refrig,curcuit boards

thats normally a problem of either parts wear and tear or spiking in the the AC line ... if something like a water pump or something that turns on and then off suddenly is on the same line as the refridgerator it can cause such a problem also if the wires in the wall outlet or panel box have begun to run slack it can cause such problems as well ....

Posted on May 19, 2009

  • 68 Answers

SOURCE: Norcold DE704D won't switch to AC

http://www.thetford.com/LinkClick.aspx?fileticket=slRtJeja7H4%3d&tabid=497&mid=1316
This link will help with testing and resolve your problem. Can not resolve without these tests.
Thanks for using Fixya
Jerry

Posted on Mar 30, 2009

kel1guy2002
  • 3740 Answers

SOURCE: Dometic refrigerator model RM 2193

Hi and welcome to FixYa, I am Kelly
Operators manual:
http://www.gas-refrigerators.com/pdf/RM2193-manual.pdf
Parts manual:
http://www.scamptrailers.com/Portals/0/Dometic_Refrig_RM2193_PartsList.pdf
If you look at the last page of the parts list (page 10) it is showing a thermostat across the Black and white wires.
There is not a fuse that I can see. The fuse has to be external to the unit. You should be able to read continuity (resistance) of the AC heating element at the power cord with the AC switch ON.
AC Power source must be removed to perform resistance checks.

No continuity there are 2 possibile failures (Other than wiring)
1. AC heating element
2. Thermostat.

Thanks for choosing FixYa,
Kelly


Posted on Jul 22, 2011

Testimonial: "very clear answer to my question i determined that the AC heating element was at fault. no connectivity as suggested in the question. "

motor1258
  • 6674 Answers

SOURCE: I have an old RM

Easiest and cheapest solution I see is to by a simple 12 Volt toggle switch and cut one of the wires from board to 12 VDC element and run it to a toggle switch mounted inside near fridge. One terminal on switch will be wire from board, and other terminal on switch will have wire going back to wire cut going to element. Simple and cheap , on, off, solution, just be sure to use heavy enough gauge wire, and add an inline fuse if you want for added safety.

Posted on Sep 18, 2011

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Dometic refrigerator model RM 2193 for RV works only in the DC and LP Gas mode. two days ago the AC mode was still working and stopped yesterday (outside temperature was about 40 degrees...


Hi and welcome to FixYa, I am Kelly
Operators manual:
http://www.gas-refrigerators.com/pdf/RM2193-manual.pdf
Parts manual:
http://www.scamptrailers.com/Portals/0/Dometic_Refrig_RM2193_PartsList.pdf
If you look at the last page of the parts list (page 10) it is showing a thermostat across the Black and white wires.
There is not a fuse that I can see. The fuse has to be external to the unit. You should be able to read continuity (resistance) of the AC heating element at the power cord with the AC switch ON.
AC Power source must be removed to perform resistance checks.

No continuity there are 2 possibile failures (Other than wiring)
1. AC heating element
2. Thermostat.

Thanks for choosing FixYa,
Kelly


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1 Answer

Refrigerator will not cool on electric or gas. When plugged in, it keeps trying to switch to gas. We switched it to gas but it would not stay lit. Checked wiring and found a blue wire disconnected and a...


Hi and welcome to FixYa, I am Kelly

The blue wire disconnected and the 30 amp fuse being pulled is typical of a DC circuit problem. What concerns me is the fact that someone had to put a 30 amp fuse in a 3 or 5 amp circuit. Maybe you meant to say 3.0 amp.

The unit uses a 5 amp fuse on J5 of the main board for AC power and a 3 amp fuse on J1 of the main board for DC power.

See page 17 of this manual:
http://www.gas-refrigerators.com/pdf/RM2852-manual.pdf

For part numbers of parts see Appendix A in this manual:
http://www.dometic.com/c415ec17-8004-4fef-9a97-c68e601bf593.fodoc

You will need to use this manual to troubleshoot:
http://bryantrv.com/docs2/docs/1252service.pdf
See step 3 page 2 to start... where is says Operation you have to perform the testing steps listed below Operation.

Operation

AC Volts

Fuse

Heating Element

Wiring
Lower Circuit Board

From the hip given the fuse was removed I would suspect the heating element but.. follow the sequence above.

Thanks for choosing FixYa,
Kelly

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Hello,

The old converter may have blown out the control board for your 'fridge. This is quite common if the voltage exceeds 15.5 volts, and when there is a ripple voltage (AC voltage component) riding on top of the DC voltage.

Gas / LP mode is the default for this fridge, a fail safe mode.

You can find the service manual for your fridge here.

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