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 Celsius). 110/120 volt available at plug in behind ventilation vents. the manual says to check the AC fuse, unfortunately I cannot locate the fuse.

If it's a refrigerator problem, I would look towards the rear circuit board first. It sounds to me like you probably have an issue with your inverter. The refrigerator operates on 12V DC, not AC. So when you unplug it, it should stay on and simply start working on the LP side of things. Try hooking the refrigerator up to an independent 12V battery. It should work perfectly fine when you unplug the unit from AC at that point. You most likely have something called AC ripple caused from a bad inverter. Anyhow, checkout The Dometic Guy to see if they can help: The Dometic Guy Dometic RV refrigerator parts and products for sale

RV Refrigerator Stop Working? - RVing - Fun Times Guide

rv-roadtrips.thefuntimesguide.com/2009/09/rv_refrigerator.php

If your refrigerator works on gas, but won't work on electric, you may have a burned out.... Cirtis, We are camping in Montana and our dometic refrigerator decided to stop ......Won't know until you can confirm you have proper voltage to the fridge. ... If you have confirmed both 12 vdc and 110 vac power at the fridge, I would ...

[PDF]Dometic Manual Refrigerator Diagnostic Service Manual

www.nationalserroscotty.org/resources/dometic-service-manual.pdf

Dometic Manual Refrigerators. ... 110 Volt Plug. 2. .... This is Dometic's Manual Refrigeration Diagnosis and Troubleshooting program. In this ... we will discuss the way an absorption cooling unit operates, and the ... gas, 120 volts AC and 12 volts DC .....In this condition we are still boiling ammonia but have no hydrogen for.

Dometic Fridge problems - RV mechanic

This is an RV frig correct? It SHOULD work either/or. AC or DC. If your plugged into AC then often the frig will work with that alone. DC is for when you have no AC so you can power your appliances of the battery. Maybe you have a converter (AC to DC which most RV's do) that somehow is not getting the DC to the frig.

If you need further help, reach me via phone at https://www.6ya.com/expert/steve_24d988f3507f7480

According to the service tip manual if your check light is on then it will be one of these:

DC Volts

Wiring

LP Gas

Manual Gas Valve

Solenoid

Orifice

Burner

Thermocouple
Lower circuit Board

Since it does it on both AC and gas, you can toss out the LP Gas, Manual Gas Valve, Orifice and Burner.

Make sure that you have good DC voltage and tight connection to your refrigerator.

http://www.gas-refrigerators.com/pdf/RM2193-parts.pdf

I would suspect either the DC Switch - Item 406 or the heating element Item 446.

But before you start ordering parts you might take the time to clean the DC leads to the unit, since they corrode quickly. If you have a multimeter you can also check the switch to make sure which part should be replaced.

If it works on gas and NOT electricity then the heating element is not getting power or the heating element is open. The heating element is located on the tubing just aft of where the pilot flame is on the bottom of the copper tube. You should check for power to the heating element and with power off perfom a continuity check on the element. I really do not at this time think you have a heating element problem.

There is a 120VAV element a AND a 12VDC element. The chances of both of these failing at the same time is pretty slim.

There is a note in the manual:
If the gas only pushbutton is depressed the
lamp will illuminate green and the refrigerator
will only operate on the LP gas mode, even if q
120 or 12 volts are available.

Another significant change in the third
generation A.E.S. system is how the 12 volt
heating element mode operates. As with the
first and second generation series, the 12 volt
heating element circuit is energized by the
ignition lock terminal. This terminal receives
its DC voltage from a wire that runs from the
run side of the vehicle’s ignition switch to the
refrigerator’s ignition lock terminal. This
allows the 12 volt heating element to be
energized only when the RV is traveling down
the road.
When the ignition lock terminal is energized
by the ignition key, the printed circuit board
must see at least 13.3 volts DC for a period of
40 seconds before the system will activate the
12 volt DC heating element.
If 13.3 volts is not achieved in this time frame,
the electronics will light the LP gas burner and
the refrigerator will operate on the LP gas
mode.
LOWER THAN 13.3 V.D.C. =LP Operation

If the battery voltage remains low after the
delay cycle, the automatic controls will light
the refrigerator on the LP gas mode and stay
on the gas mode until the printed circuit board
sees approximately 13.3 volts DC to the
terminal block.

For proper cooling on the AC mode, the AC
voltage to the refrigerator should not vary
more than 10 percent from the voltage rating
on the heating element. Heating elements used
in Dometic refrigerators could have a rated
voltage of 110 volts, 115 volts or 120 volts AC.
Because of this, the power requirements for
each differently rated heating element will
vary. For example, if a heating element is
rated for 100 volts, the acceptable power range
would be between 99 to 121 volts AC. If an
element is rated for 115 volts, the acceptable
power range would be between 103.5 to 126.5
volts AC. If the heater is rated for 120 volts,
the acceptable AC power range would be
between 108 to 132 volts AC.

The unit to operate on either AC or DC must have 13.3 volts to the unit. I think this is where your problem lies in that the battery voltage is less than 13.3 VDC


If all of that checks good just repsond here and I will help you. There is still more that can be checked.

Thanks for choosing FixYa.

Kelly

low on refrigerant gas or dc voltage drop.

Yes it can also run on 120 AC and 12 volt DC

Here is the website. If you need help in understanding let me know

http://www.campingworld.com/shopping/item/dometic-rm2193-compact-refrigerator/13473